85912640 has 56 divisors (see below), whose sum is σ = 223186752. Its totient is φ = 31239680.

The previous prime is 85912639. The next prime is 85912681. The reversal of 85912640 is 4621958.

It is a self number, because there is not a number n which added to its sum of digits gives 85912640.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8684 + ... + 15723.

Almost surely, 2^85912640 is an apocalyptic number.

85912640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

85912640 is an abundant number, since it is smaller than the sum of its proper divisors (137274112).

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

85912640 is a wasteful number, since it uses less digits than its factorization.

85912640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24435 (or 24425 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 85912640 is about 9268.9071631989. The cubic root of 85912640 is about 441.2509853466.

The spelling of 85912640 in words is "eighty-five million, nine hundred twelve thousand, six hundred forty".