7725731997 has 4 divisors (see below), whose sum is σ = 10300976000. Its totient is φ = 5150487996.

The previous prime is 7725731983. The next prime is 7725731999. The reversal of 7725731997 is 7991375277.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 7725731997 - 2³⁰ = 6651990173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7725731999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1287621997 + ... + 1287622002.

It is an arithmetic number, because the mean of its divisors is an integer number (2575244000).

Almost surely, 2^7725731997 is an apocalyptic number.

It is an amenable number.

7725731997 is a deficient number, since it is larger than the sum of its proper divisors (2575244003).

7725731997 is a wasteful number, since it uses less digits than its factorization.

7725731997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2575244002.

The product of its digits is 5834430, while the sum is 57.

The square root of 7725731997 is about 87896.1432430343. The cubic root of 7725731997 is about 1976.8780509495.

The spelling of 7725731997 in words is "seven billion, seven hundred twenty-five million, seven hundred thirty-one thousand, nine hundred ninety-seven".