51721710 has 32 divisors (see below), whose sum is σ = 129530880. Its totient is φ = 13192608.

The previous prime is 51721697. The next prime is 51721721. The reversal of 51721710 is 1712715.

It is a happy number.

It is a Curzon 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, 36790 + ... + 38169.

It is an arithmetic number, because the mean of its divisors is an integer number (4047840).

Almost surely, 2^51721710 is an apocalyptic number.

51721710 is an abundant number, since it is smaller than the sum of its proper divisors (77809170).

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

51721710 is a wasteful number, since it uses less digits than its factorization.

51721710 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74992.

The product of its (nonzero) digits is 490, while the sum is 24.

The square root of 51721710 is about 7191.7807252446. The cubic root of 51721710 is about 372.5840778336.

The spelling of 51721710 in words is "fifty-one million, seven hundred twenty-one thousand, seven hundred ten".