51787655 has 8 divisors (see below), whose sum is σ = 63467712. Its totient is φ = 40548448.

The previous prime is 51787607. The next prime is 51787657. The reversal of 51787655 is 55678715.

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

It is a cyclic number.

It is not a de Polignac number, because 51787655 - 2⁸ = 51787399 is a prime.

It is a super-2 number, since 2×51787655² = 5363922420798050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51787657) 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, 109952 + ... + 110421.

It is an arithmetic number, because the mean of its divisors is an integer number (7933464).

Almost surely, 2^51787655 is an apocalyptic number.

51787655 is a deficient number, since it is larger than the sum of its proper divisors (11680057).

51787655 is a wasteful number, since it uses less digits than its factorization.

51787655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220425.

The product of its digits is 294000, while the sum is 44.

The square root of 51787655 is about 7196.3640124719. The cubic root of 51787655 is about 372.7423583839.

The spelling of 51787655 in words is "fifty-one million, seven hundred eighty-seven thousand, six hundred fifty-five".