78525525 has 48 divisors (see below), whose sum is σ = 143143616. Its totient is φ = 37739520.

The previous prime is 78525521. The next prime is 78525527. The reversal of 78525525 is 52552587.

It is not a de Polignac number, because 78525525 - 2² = 78525521 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78525521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 40989 + ... + 42861.

Almost surely, 2^78525525 is an apocalyptic number.

78525525 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78525525 is a deficient number, since it is larger than the sum of its proper divisors (64618091).

78525525 is a wasteful number, since it uses less digits than its factorization.

78525525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1942 (or 1937 counting only the distinct ones).

The product of its digits is 140000, while the sum is 39.

The square root of 78525525 is about 8861.4629153430. The cubic root of 78525525 is about 428.2232890994.

The spelling of 78525525 in words is "seventy-eight million, five hundred twenty-five thousand, five hundred twenty-five".