8422694640 has 120 divisors (see below), whose sum is σ = 28444674960. Its totient is φ = 2233469952.

The previous prime is 8422694633. The next prime is 8422694647. The reversal of 8422694640 is 464962248.

It is an interprime number because it is at equal distance from previous prime (8422694633) and next prime (8422694647).

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8422694647) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 96204 + ... + 161556.

It is an arithmetic number, because the mean of its divisors is an integer number (237038958).

Almost surely, 2^8422694640 is an apocalyptic number.

8422694640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8422694640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14222337480).

8422694640 is an abundant number, since it is smaller than the sum of its proper divisors (20021980320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8422694640 is a wasteful number, since it uses less digits than its factorization.

8422694640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65551 (or 65542 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 45.

The square root of 8422694640 is about 91775.2397981068. The cubic root of 8422694640 is about 2034.6217618094.

The spelling of 8422694640 in words is "eight billion, four hundred twenty-two million, six hundred ninety-four thousand, six hundred forty".