55047280 has 40 divisors (see below), whose sum is σ = 133553952. Its totient is φ = 21060864.

The previous prime is 55047271. The next prime is 55047281. The reversal of 55047280 is 8274055.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55047281) 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, 13119 + ... + 16798.

Almost surely, 2^55047280 is an apocalyptic number.

It is an amenable number.

55047280 is an abundant number, since it is smaller than the sum of its proper divisors (78506672).

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

55047280 is a wasteful number, since it uses less digits than its factorization.

55047280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29953 (or 29947 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 31.

The square root of 55047280 is about 7419.3854192918. The cubic root of 55047280 is about 380.4041867398.

The spelling of 55047280 in words is "fifty-five million, forty-seven thousand, two hundred eighty".