55707720 has 64 divisors (see below), whose sum is σ = 168696000. Its totient is φ = 14715648.

The previous prime is 55707709. The next prime is 55707721. The reversal of 55707720 is 2770755.

It is not an unprimeable number, because it can be changed into a prime (55707721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10951 + ... + 15209.

It is an arithmetic number, because the mean of its divisors is an integer number (2635875).

Almost surely, 2^55707720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55707720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84348000).

55707720 is an abundant number, since it is smaller than the sum of its proper divisors (112988280).

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

55707720 is a wasteful number, since it uses less digits than its factorization.

55707720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4382 (or 4378 counting only the distinct ones).

The product of its (nonzero) digits is 17150, while the sum is 33.

The square root of 55707720 is about 7463.7604463166. The cubic root of 55707720 is about 381.9194662243.

The spelling of 55707720 in words is "fifty-five million, seven hundred seven thousand, seven hundred twenty".