79725725 has 6 divisors (see below), whose sum is σ = 98859930. Its totient is φ = 63780560.

The previous prime is 79725721. The next prime is 79725731. The reversal of 79725725 is 52752797.

It can be written as a sum of positive squares in 3 ways, for example, as 7628644 + 72097081 = 2762^2 + 8491^2 .

It is not a de Polignac number, because 79725725 - 2² = 79725721 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79725721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1594490 + ... + 1594539.

It is an arithmetic number, because the mean of its divisors is an integer number (16476655).

Almost surely, 2^79725725 is an apocalyptic number.

It is an amenable number.

79725725 is a deficient number, since it is larger than the sum of its proper divisors (19134205).

79725725 is a wasteful number, since it uses less digits than its factorization.

79725725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3189039 (or 3189034 counting only the distinct ones).

The product of its digits is 308700, while the sum is 44.

The square root of 79725725 is about 8928.9263072331. The cubic root of 79725725 is about 430.3939512061.

The spelling of 79725725 in words is "seventy-nine million, seven hundred twenty-five thousand, seven hundred twenty-five".