51977645 has 8 divisors (see below), whose sum is σ = 62412000. Its totient is φ = 41556240.

The previous prime is 51977641. The next prime is 51977647. The reversal of 51977645 is 54677915.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51977645 - 2² = 51977641 is a prime.

It is a super-3 number, since 3×51977645³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51977596 and 51977605.

It is a congruent number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13106 + ... + 16604.

It is an arithmetic number, because the mean of its divisors is an integer number (7801500).

Almost surely, 2^51977645 is an apocalyptic number.

It is an amenable number.

51977645 is a deficient number, since it is larger than the sum of its proper divisors (10434355).

51977645 is a wasteful number, since it uses less digits than its factorization.

51977645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6475.

The product of its digits is 264600, while the sum is 44.

The square root of 51977645 is about 7209.5523439393. The cubic root of 51977645 is about 373.1976206517.

The spelling of 51977645 in words is "fifty-one million, nine hundred seventy-seven thousand, six hundred forty-five".