78645500 has 24 divisors (see below), whose sum is σ = 171762864. Its totient is φ = 31458000.

The previous prime is 78645499. The next prime is 78645517. The reversal of 78645500 is 554687.

It is a super-2 number, since 2×78645500² = 12370229340500000, which contains 22 as substring.

It is a congruent number.

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, 78146 + ... + 79145.

It is an arithmetic number, because the mean of its divisors is an integer number (7156786).

Almost surely, 2^78645500 is an apocalyptic number.

It is an amenable number.

78645500 is an abundant number, since it is smaller than the sum of its proper divisors (93117364).

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

78645500 is a wasteful number, since it uses less digits than its factorization.

78645500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157310 (or 157298 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 35.

The square root of 78645500 is about 8868.2298120876. The cubic root of 78645500 is about 428.4412647040.

The spelling of 78645500 in words is "seventy-eight million, six hundred forty-five thousand, five hundred".