55277985 has 32 divisors (see below), whose sum is σ = 102804480. Its totient is φ = 24838848.

The previous prime is 55277977. The next prime is 55277987. The reversal of 55277985 is 58977255.

It is not a de Polignac number, because 55277985 - 2³ = 55277977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55277987) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1734 + ... + 10656.

It is an arithmetic number, because the mean of its divisors is an integer number (3212640).

Almost surely, 2^55277985 is an apocalyptic number.

It is an amenable number.

55277985 is a deficient number, since it is larger than the sum of its proper divisors (47526495).

55277985 is a wasteful number, since it uses less digits than its factorization.

55277985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8997.

The product of its digits is 882000, while the sum is 48.

The square root of 55277985 is about 7434.9166101578. The cubic root of 55277985 is about 380.9348749607.

The spelling of 55277985 in words is "fifty-five million, two hundred seventy-seven thousand, nine hundred eighty-five".