155977220 has 48 divisors (see below), whose sum is σ = 375070080. Its totient is φ = 53374464.

The previous prime is 155977219. The next prime is 155977253. The reversal of 155977220 is 22779551.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119612 + ... + 120908.

It is an arithmetic number, because the mean of its divisors is an integer number (7813960).

Almost surely, 2^155977220 is an apocalyptic number.

155977220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155977220 is an abundant number, since it is smaller than the sum of its proper divisors (219092860).

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

155977220 is a wasteful number, since it uses less digits than its factorization.

155977220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2172 (or 2170 counting only the distinct ones).

The product of its (nonzero) digits is 44100, while the sum is 38.

The square root of 155977220 is about 12489.0840336672. The cubic root of 155977220 is about 538.2950570308.

The spelling of 155977220 in words is "one hundred fifty-five million, nine hundred seventy-seven thousand, two hundred twenty".