55777628 has 6 divisors (see below), whose sum is σ = 97610856. Its totient is φ = 27888812.

The previous prime is 55777627. The next prime is 55777633. The reversal of 55777628 is 82677755.

It is a happy number.

55777628 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×55777628² = 6222287570612768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55777627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6972200 + ... + 6972207.

It is an arithmetic number, because the mean of its divisors is an integer number (16268476).

Almost surely, 2^55777628 is an apocalyptic number.

It is an amenable number.

55777628 is a deficient number, since it is larger than the sum of its proper divisors (41833228).

55777628 is a wasteful number, since it uses less digits than its factorization.

55777628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13944411 (or 13944409 counting only the distinct ones).

The product of its digits is 823200, while the sum is 47.

The square root of 55777628 is about 7468.4421400986. The cubic root of 55777628 is about 382.0791572298.

The spelling of 55777628 in words is "fifty-five million, seven hundred seventy-seven thousand, six hundred twenty-eight".