55751820 has 24 divisors (see below), whose sum is σ = 156105264. Its totient is φ = 14867136.

The previous prime is 55751819. The next prime is 55751821. The reversal of 55751820 is 2815755.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (55751819) and next prime (55751821).

It is not an unprimeable number, because it can be changed into a prime (55751821) 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, 464539 + ... + 464658.

It is an arithmetic number, because the mean of its divisors is an integer number (6504386).

Almost surely, 2^55751820 is an apocalyptic number.

It is an amenable number.

55751820 is an abundant number, since it is smaller than the sum of its proper divisors (100353444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55751820 is a wasteful number, since it uses less digits than its factorization.

55751820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929209 (or 929207 counting only the distinct ones).

The product of its (nonzero) digits is 14000, while the sum is 33.

The square root of 55751820 is about 7466.7141367539. The cubic root of 55751820 is about 382.0202195012.

The spelling of 55751820 in words is "fifty-five million, seven hundred fifty-one thousand, eight hundred twenty".