55507380 has 48 divisors (see below), whose sum is σ = 164566080. Its totient is φ = 13931008.

The previous prime is 55507369. The next prime is 55507381. The reversal of 55507380 is 8370555.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55507381) 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, 26190 + ... + 28229.

It is an arithmetic number, because the mean of its divisors is an integer number (3428460).

Almost surely, 2^55507380 is an apocalyptic number.

It is an amenable number.

55507380 is an abundant number, since it is smaller than the sum of its proper divisors (109058700).

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

55507380 is a wasteful number, since it uses less digits than its factorization.

55507380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54448 (or 54446 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 33.

The square root of 55507380 is about 7450.3275095797. The cubic root of 55507380 is about 381.4610877989.

The spelling of 55507380 in words is "fifty-five million, five hundred seven thousand, three hundred eighty".