31402728925 has 12 divisors (see below), whose sum is σ = 38943792160. Its totient is φ = 25119339120.

The previous prime is 31402728919. The next prime is 31402728941. The reversal of 31402728925 is 52982720413.

It is not a de Polignac number, because 31402728925 - 2¹⁹ = 31402204637 is a prime.

It is a super-2 number, since 2×31402728925² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 170206 + ... + 302944.

Almost surely, 2^31402728925 is an apocalyptic number.

It is an amenable number.

31402728925 is a deficient number, since it is larger than the sum of its proper divisors (7541063235).

31402728925 is a wasteful number, since it uses less digits than its factorization.

31402728925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142212 (or 142207 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 31402728925 in words is "thirty-one billion, four hundred two million, seven hundred twenty-eight thousand, nine hundred twenty-five".