55277220 has 24 divisors (see below), whose sum is σ = 154776384. Its totient is φ = 14740576.

The previous prime is 55277197. The next prime is 55277221. The reversal of 55277220 is 2277255.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (55277221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 460584 + ... + 460703.

It is an arithmetic number, because the mean of its divisors is an integer number (6449016).

Almost surely, 2^55277220 is an apocalyptic number.

It is an amenable number.

55277220 is an abundant number, since it is smaller than the sum of its proper divisors (99499164).

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

55277220 is a wasteful number, since it uses less digits than its factorization.

55277220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921299 (or 921297 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 30.

The square root of 55277220 is about 7434.8651635386. The cubic root of 55277220 is about 380.9331176817.

The spelling of 55277220 in words is "fifty-five million, two hundred seventy-seven thousand, two hundred twenty".