56728251 has 6 divisors (see below), whose sum is σ = 81940820. Its totient is φ = 37818828.

The previous prime is 56728249. The next prime is 56728253. The reversal of 56728251 is 15282765.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (56728249) and next prime (56728253).

It is not a de Polignac number, because 56728251 - 2¹ = 56728249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56728253) 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, 3151561 + ... + 3151578.

Almost surely, 2^56728251 is an apocalyptic number.

56728251 is a deficient number, since it is larger than the sum of its proper divisors (25212569).

56728251 is a wasteful number, since it uses less digits than its factorization.

56728251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6303145 (or 6303142 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 56728251 is about 7531.8159164972. The cubic root of 56728251 is about 384.2375442672.

The spelling of 56728251 in words is "fifty-six million, seven hundred twenty-eight thousand, two hundred fifty-one".