55040790 has 64 divisors (see below), whose sum is σ = 151603200. Its totient is φ = 12528000.

The previous prime is 55040773. The next prime is 55040879. The reversal of 55040790 is 9704055.

55040790 = 251² + 252² + ... + 565².

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72915 + ... + 73665.

It is an arithmetic number, because the mean of its divisors is an integer number (2368800).

Almost surely, 2^55040790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55040790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75801600).

55040790 is an abundant number, since it is smaller than the sum of its proper divisors (96562410).

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

55040790 is a wasteful number, since it uses less digits than its factorization.

55040790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117.

The product of its (nonzero) digits is 6300, while the sum is 30.

The square root of 55040790 is about 7418.9480386373. The cubic root of 55040790 is about 380.3892364389.

The spelling of 55040790 in words is "fifty-five million, forty thousand, seven hundred ninety".