28731951 has 6 divisors (see below), whose sum is σ = 41501720. Its totient is φ = 19154628.

The previous prime is 28731949. The next prime is 28731973. The reversal of 28731951 is 15913782.

It is not a de Polignac number, because 28731951 - 2¹ = 28731949 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 (28731931) 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, 1596211 + ... + 1596228.

Almost surely, 2^28731951 is an apocalyptic number.

28731951 is a deficient number, since it is larger than the sum of its proper divisors (12769769).

28731951 is a wasteful number, since it uses less digits than its factorization.

28731951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3192445 (or 3192442 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 28731951 is about 5360.2193052150. The cubic root of 28731951 is about 306.2821631637.

Subtracting from 28731951 its product of digits (15120), we obtain a triangular number (28716831 = T₇₅₇₈).

The spelling of 28731951 in words is "twenty-eight million, seven hundred thirty-one thousand, nine hundred fifty-one".