84997640 has 128 divisors (see below), whose sum is σ = 247968000. Its totient is φ = 25463808.

The previous prime is 84997631. The next prime is 84997657. The reversal of 84997640 is 4679948.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68546 + ... + 69774.

It is an arithmetic number, because the mean of its divisors is an integer number (1937250).

Almost surely, 2^84997640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 84997640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123984000).

84997640 is an abundant number, since it is smaller than the sum of its proper divisors (162970360).

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

84997640 is a wasteful number, since it uses less digits than its factorization.

84997640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279 (or 1275 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 84997640 is about 9219.4164674344. The cubic root of 84997640 is about 439.6788979554.

It can be divided in two parts, 849 and 97640, that added together give a palindrome (98489).

The spelling of 84997640 in words is "eighty-four million, nine hundred ninety-seven thousand, six hundred forty".