51477990 has 32 divisors (see below), whose sum is σ = 123922656. Its totient is φ = 13685760.

The previous prime is 51477977. The next prime is 51478013. The reversal of 51477990 is 9977415.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8160 + ... + 13020.

It is an arithmetic number, because the mean of its divisors is an integer number (3872583).

Almost surely, 2^51477990 is an apocalyptic number.

51477990 is an abundant number, since it is smaller than the sum of its proper divisors (72444666).

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

51477990 is a wasteful number, since it uses less digits than its factorization.

51477990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5224.

The product of its (nonzero) digits is 79380, while the sum is 42.

The square root of 51477990 is about 7174.8163739569. The cubic root of 51477990 is about 371.9979332756.

The spelling of 51477990 in words is "fifty-one million, four hundred seventy-seven thousand, nine hundred ninety".