55302780 has 48 divisors (see below), whose sum is σ = 166761504. Its totient is φ = 13612800.

The previous prime is 55302763. The next prime is 55302781. The reversal of 55302780 is 8720355.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55302781) 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, 34671 + ... + 36230.

It is an arithmetic number, because the mean of its divisors is an integer number (3474198).

Almost surely, 2^55302780 is an apocalyptic number.

It is an amenable number.

55302780 is an abundant number, since it is smaller than the sum of its proper divisors (111458724).

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

55302780 is a wasteful number, since it uses less digits than its factorization.

55302780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70926 (or 70924 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 55302780 is about 7436.5838931595. The cubic root of 55302780 is about 380.9918226970.

The spelling of 55302780 in words is "fifty-five million, three hundred two thousand, seven hundred eighty".