28715031 has 6 divisors (see below), whose sum is σ = 41477280. Its totient is φ = 19143348.

The previous prime is 28715009. The next prime is 28715039. The reversal of 28715031 is 13051782.

It is not a de Polignac number, because 28715031 - 2⁶ = 28714967 is a prime.

It is a super-2 number, since 2×28715031² = 1649106010661922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28714986 and 28715004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28715039) 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, 1595271 + ... + 1595288.

It is an arithmetic number, because the mean of its divisors is an integer number (6912880).

Almost surely, 2^28715031 is an apocalyptic number.

28715031 is a deficient number, since it is larger than the sum of its proper divisors (12762249).

28715031 is a wasteful number, since it uses less digits than its factorization.

28715031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3190565 (or 3190562 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 28715031 is about 5358.6407791529. The cubic root of 28715031 is about 306.2220290433. Note that the first 3 decimals are identical.

The spelling of 28715031 in words is "twenty-eight million, seven hundred fifteen thousand, thirty-one".