51709652 has 12 divisors (see below), whose sum is σ = 90658260. Its totient is φ = 25807296.

The previous prime is 51709649. The next prime is 51709657. The reversal of 51709652 is 25690715.

It can be written as a sum of positive squares in 2 ways, for example, as 19945156 + 31764496 = 4466^2 + 5636^2 .

It is a super-2 number, since 2×51709652² = 5347776219922208, which contains 22 as substring.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51709657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9377 + ... + 13832.

It is an arithmetic number, because the mean of its divisors is an integer number (7554855).

Almost surely, 2^51709652 is an apocalyptic number.

It is an amenable number.

51709652 is a deficient number, since it is larger than the sum of its proper divisors (38948608).

51709652 is a wasteful number, since it uses less digits than its factorization.

51709652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23770 (or 23768 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 51709652 is about 7190.9423582727. The cubic root of 51709652 is about 372.5551217919. Note that the first 3 decimals are identical.

The spelling of 51709652 in words is "fifty-one million, seven hundred nine thousand, six hundred fifty-two".