55633780 has 24 divisors (see below), whose sum is σ = 121911552. Its totient is φ = 21285792.

The previous prime is 55633771. The next prime is 55633783. The reversal of 55633780 is 8733655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55633783) 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, 60012 + ... + 60931.

It is an arithmetic number, because the mean of its divisors is an integer number (5079648).

Almost surely, 2^55633780 is an apocalyptic number.

It is an amenable number.

55633780 is an abundant number, since it is smaller than the sum of its proper divisors (66277772).

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

55633780 is a wasteful number, since it uses less digits than its factorization.

55633780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120975 (or 120973 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 37.

The square root of 55633780 is about 7458.8055344003. The cubic root of 55633780 is about 381.7504194665.

The spelling of 55633780 in words is "fifty-five million, six hundred thirty-three thousand, seven hundred eighty".