78700565 has 16 divisors (see below), whose sum is σ = 105261120. Its totient is φ = 56136960.

The previous prime is 78700543. The next prime is 78700571. The reversal of 78700565 is 56500787.

It is not a de Polignac number, because 78700565 - 2¹² = 78696469 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22751 + ... + 25980.

It is an arithmetic number, because the mean of its divisors is an integer number (6578820).

Almost surely, 2^78700565 is an apocalyptic number.

It is an amenable number.

78700565 is a deficient number, since it is larger than the sum of its proper divisors (26560555).

78700565 is a wasteful number, since it uses less digits than its factorization.

78700565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48772.

The product of its (nonzero) digits is 58800, while the sum is 38.

The square root of 78700565 is about 8871.3338906841. Note that the first 3 decimals coincide. The cubic root of 78700565 is about 428.5412348834.

The spelling of 78700565 in words is "seventy-eight million, seven hundred thousand, five hundred sixty-five".