78325840 has 40 divisors (see below), whose sum is σ = 187987968. Its totient is φ = 30318720.

The previous prime is 78325823. The next prime is 78325883. The reversal of 78325840 is 4852387.

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

It is a super-2 number, since 2×78325840² = 12269874423411200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 78325840.

It is a congruent number.

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, 13312 + ... + 18271.

Almost surely, 2^78325840 is an apocalyptic number.

It is an amenable number.

78325840 is an abundant number, since it is smaller than the sum of its proper divisors (109662128).

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

78325840 is a wasteful number, since it uses less digits than its factorization.

78325840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31627 (or 31621 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 78325840 is about 8850.1886985533. The cubic root of 78325840 is about 427.8600002118.

The spelling of 78325840 in words is "seventy-eight million, three hundred twenty-five thousand, eight hundred forty".