78525591 has 16 divisors (see below), whose sum is σ = 109020000. Its totient is φ = 50214528.

The previous prime is 78525563. The next prime is 78525593. The reversal of 78525591 is 19552587.

It is not a de Polignac number, because 78525591 - 2⁶ = 78525527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78525593) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10785 + ... + 16533.

It is an arithmetic number, because the mean of its divisors is an integer number (6813750).

Almost surely, 2^78525591 is an apocalyptic number.

78525591 is a deficient number, since it is larger than the sum of its proper divisors (30494409).

78525591 is a wasteful number, since it uses less digits than its factorization.

78525591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5938.

The product of its digits is 126000, while the sum is 42.

The square root of 78525591 is about 8861.4666393323. The cubic root of 78525591 is about 428.2234090720.

The spelling of 78525591 in words is "seventy-eight million, five hundred twenty-five thousand, five hundred ninety-one".