818077440 has 144 divisors (see below), whose sum is σ = 2630775168. Its totient is φ = 216649728.

The previous prime is 818077331. The next prime is 818077453. The reversal of 818077440 is 44770818.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 625267 + ... + 626573.

It is an arithmetic number, because the mean of its divisors is an integer number (18269272).

Almost surely, 2^818077440 is an apocalyptic number.

818077440 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 818077440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1315387584).

818077440 is an abundant number, since it is smaller than the sum of its proper divisors (1812697728).

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

818077440 is a wasteful number, since it uses less digits than its factorization.

818077440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1494 (or 1480 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 39.

The square root of 818077440 is about 28602.0530731624. The cubic root of 818077440 is about 935.2580869322.

The spelling of 818077440 in words is "eight hundred eighteen million, seventy-seven thousand, four hundred forty".