85921378320 has 40 divisors (see below), whose sum is σ = 266356273536. Its totient is φ = 22912367488.

The previous prime is 85921378313. The next prime is 85921378331. The reversal of 85921378320 is 2387312958.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 85921378320.

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, 179002632 + ... + 179003111.

Almost surely, 2^85921378320 is an apocalyptic number.

85921378320 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

85921378320 is an abundant number, since it is smaller than the sum of its proper divisors (180434895216).

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

85921378320 is a wasteful number, since it uses less digits than its factorization.

85921378320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358005759 (or 358005753 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 48.

The spelling of 85921378320 in words is "eighty-five billion, nine hundred twenty-one million, three hundred seventy-eight thousand, three hundred twenty".