51977644 has 12 divisors (see below), whose sum is σ = 91899304. Its totient is φ = 25720704.

The previous prime is 51977641. The next prime is 51977647. The reversal of 51977644 is 44677915.

51977644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51977641) and next prime (51977647).

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 51977644.

It is not an unprimeable number, because it can be changed into a prime (51977641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66594 + ... + 67369.

Almost surely, 2^51977644 is an apocalyptic number.

It is an amenable number.

51977644 is a deficient number, since it is larger than the sum of its proper divisors (39921660).

51977644 is a wasteful number, since it uses less digits than its factorization.

51977644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134064 (or 134062 counting only the distinct ones).

The product of its digits is 211680, while the sum is 43.

The square root of 51977644 is about 7209.5522745868. The cubic root of 51977644 is about 373.1976182584.

The spelling of 51977644 in words is "fifty-one million, nine hundred seventy-seven thousand, six hundred forty-four".