55400766 has 32 divisors (see below), whose sum is σ = 114569088. Its totient is φ = 17845920.

The previous prime is 55400753. The next prime is 55400771. The reversal of 55400766 is 66700455.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35421 + ... + 36951.

It is an arithmetic number, because the mean of its divisors is an integer number (3580284).

Almost surely, 2^55400766 is an apocalyptic number.

55400766 is an abundant number, since it is smaller than the sum of its proper divisors (59168322).

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

55400766 is a wasteful number, since it uses less digits than its factorization.

55400766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1736.

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 55400766 is about 7443.1690831258. The cubic root of 55400766 is about 381.2167049308.

Adding to 55400766 its reverse (66700455), we get a palindrome (122101221).

The spelling of 55400766 in words is "fifty-five million, four hundred thousand, seven hundred sixty-six".