55115790 has 32 divisors (see below), whose sum is σ = 132848640. Its totient is φ = 14634144.

The previous prime is 55115783. The next prime is 55115791. The reversal of 55115790 is 9751155.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55115791) 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, 3327 + ... + 11013.

It is an arithmetic number, because the mean of its divisors is an integer number (4151520).

Almost surely, 2^55115790 is an apocalyptic number.

55115790 is an abundant number, since it is smaller than the sum of its proper divisors (77732850).

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

55115790 is a wasteful number, since it uses less digits than its factorization.

55115790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7936.

The product of its (nonzero) digits is 7875, while the sum is 33.

The square root of 55115790 is about 7424.0009428879. Note that the first 3 decimals coincide. The cubic root of 55115790 is about 380.5619340832.

The spelling of 55115790 in words is "fifty-five million, one hundred fifteen thousand, seven hundred ninety".