78265920 has 56 divisors (see below), whose sum is σ = 248497344. Its totient is φ = 20870656.

The previous prime is 78265903. The next prime is 78265961. The reversal of 78265920 is 2956287.

It is a happy number.

It is a super-2 number, since 2×78265920² = 12251108466892800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39804 + ... + 41723.

Almost surely, 2^78265920 is an apocalyptic number.

It is an amenable number.

78265920 is an abundant number, since it is smaller than the sum of its proper divisors (170231424).

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

78265920 is a wasteful number, since it uses less digits than its factorization.

78265920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81547 (or 81537 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 78265920 is about 8846.8028123159. The cubic root of 78265920 is about 427.7508667441.

The spelling of 78265920 in words is "seventy-eight million, two hundred sixty-five thousand, nine hundred twenty".