51661724 has 12 divisors (see below), whose sum is σ = 90784848. Its totient is φ = 25723200.

The previous prime is 51661699. The next prime is 51661733. The reversal of 51661724 is 42716615.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25832 + ... + 27759.

It is an arithmetic number, because the mean of its divisors is an integer number (7565404).

Almost surely, 2^51661724 is an apocalyptic number.

It is an amenable number.

51661724 is a deficient number, since it is larger than the sum of its proper divisors (39123124).

51661724 is a wasteful number, since it uses less digits than its factorization.

51661724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53836 (or 53834 counting only the distinct ones).

The product of its digits is 10080, while the sum is 32.

The square root of 51661724 is about 7187.6090600422. The cubic root of 51661724 is about 372.4399831238.

The spelling of 51661724 in words is "fifty-one million, six hundred sixty-one thousand, seven hundred twenty-four".