55220764 has 12 divisors (see below), whose sum is σ = 101722600. Its totient is φ = 26157168.

The previous prime is 55220749. The next prime is 55220771. The reversal of 55220764 is 46702255.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 363219 + ... + 363370.

Almost surely, 2^55220764 is an apocalyptic number.

It is an amenable number.

55220764 is a deficient number, since it is larger than the sum of its proper divisors (46501836).

55220764 is a wasteful number, since it uses less digits than its factorization.

55220764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726612 (or 726610 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 55220764 is about 7431.0674872457. The cubic root of 55220764 is about 380.8033880163.

It can be divided in two parts, 552 and 20764, that added together give a square (21316 = 146²).

The spelling of 55220764 in words is "fifty-five million, two hundred twenty thousand, seven hundred sixty-four".