55077720 has 32 divisors (see below), whose sum is σ = 165233520. Its totient is φ = 14687360.

The previous prime is 55077707. The next prime is 55077733. The reversal of 55077720 is 2777055.

It is an interprime number because it is at equal distance from previous prime (55077707) and next prime (55077733).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 229371 + ... + 229610.

Almost surely, 2^55077720 is an apocalyptic number.

It is an amenable number.

55077720 is an abundant number, since it is smaller than the sum of its proper divisors (110155800).

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

55077720 is a wasteful number, since it uses less digits than its factorization.

55077720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458995 (or 458991 counting only the distinct ones).

The product of its (nonzero) digits is 17150, while the sum is 33.

The square root of 55077720 is about 7421.4365186263. The cubic root of 55077720 is about 380.4742923514.

The spelling of 55077720 in words is "fifty-five million, seventy-seven thousand, seven hundred twenty".