51499690 has 64 divisors (see below), whose sum is σ = 109226880. Its totient is φ = 17280000.

The previous prime is 51499661. The next prime is 51499697. The reversal of 51499690 is 9699415.

It is a super-2 number, since 2×51499690² = 5304436140192200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51499697) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85390 + ... + 85990.

It is an arithmetic number, because the mean of its divisors is an integer number (1706670).

Almost surely, 2^51499690 is an apocalyptic number.

51499690 is an abundant number, since it is smaller than the sum of its proper divisors (57727190).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51499690 is a wasteful number, since it uses less digits than its factorization.

51499690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 51499690 is about 7176.3284484477. The cubic root of 51499690 is about 372.0501965254.

The spelling of 51499690 in words is "fifty-one million, four hundred ninety-nine thousand, six hundred ninety".