51685755 has 24 divisors (see below), whose sum is σ = 90901776. Its totient is φ = 25058880.

The previous prime is 51685741. The next prime is 51685769. The reversal of 51685755 is 55758615.

It is an interprime number because it is at equal distance from previous prime (51685741) and next prime (51685769).

It is not a de Polignac number, because 51685755 - 2⁵ = 51685723 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12424 + ... + 16053.

It is an arithmetic number, because the mean of its divisors is an integer number (3787574).

Almost surely, 2^51685755 is an apocalyptic number.

51685755 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51685755 is a deficient number, since it is larger than the sum of its proper divisors (39216021).

51685755 is a wasteful number, since it uses less digits than its factorization.

51685755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28507 (or 28496 counting only the distinct ones).

The product of its digits is 210000, while the sum is 42.

The square root of 51685755 is about 7189.2805620590. The cubic root of 51685755 is about 372.4977223109.

The spelling of 51685755 in words is "fifty-one million, six hundred eighty-five thousand, seven hundred fifty-five".