51499904 has 16 divisors (see below), whose sum is σ = 102597720. Its totient is φ = 25749888.

The previous prime is 51499891. The next prime is 51499933. The reversal of 51499904 is 40999415.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-3 number, since 3×51499904³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201044 + ... + 201299.

Almost surely, 2^51499904 is an apocalyptic number.

It is an amenable number.

51499904 is a deficient number, since it is larger than the sum of its proper divisors (51097816).

51499904 is an equidigital number, since it uses as much as digits as its factorization.

51499904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402357 (or 402345 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 51499904 is about 7176.3433585636. The cubic root of 51499904 is about 372.0507118594.

The spelling of 51499904 in words is "fifty-one million, four hundred ninety-nine thousand, nine hundred four".