55816761 has 32 divisors (see below), whose sum is σ = 99929088. Its totient is φ = 26763840.

The previous prime is 55816759. The next prime is 55816799. The reversal of 55816761 is 16761855.

It is not a de Polignac number, because 55816761 - 2¹ = 55816759 is a prime.

It is a super-2 number, since 2×55816761² = 6231021617062242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (55816751) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6291 + ... + 12296.

It is an arithmetic number, because the mean of its divisors is an integer number (3122784).

Almost surely, 2^55816761 is an apocalyptic number.

It is an amenable number.

55816761 is a deficient number, since it is larger than the sum of its proper divisors (44112327).

55816761 is a wasteful number, since it uses less digits than its factorization.

55816761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18621.

The product of its digits is 50400, while the sum is 39.

The square root of 55816761 is about 7471.0615711557. The cubic root of 55816761 is about 382.1684905872.

The spelling of 55816761 in words is "fifty-five million, eight hundred sixteen thousand, seven hundred sixty-one".