51309248 has 14 divisors (see below), whose sum is σ = 101816916. Its totient is φ = 25654592.

The previous prime is 51309239. The next prime is 51309259. The reversal of 51309248 is 84290315.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400790 + ... + 400917.

Almost surely, 2^51309248 is an apocalyptic number.

It is an amenable number.

51309248 is a deficient number, since it is larger than the sum of its proper divisors (50507668).

51309248 is an equidigital number, since it uses as much as digits as its factorization.

51309248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801719 (or 801709 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 51309248 is about 7163.0473961855. The cubic root of 51309248 is about 371.5910254703.

The spelling of 51309248 in words is "fifty-one million, three hundred nine thousand, two hundred forty-eight".