155564420 has 24 divisors (see below), whose sum is σ = 356384448. Its totient is φ = 56568800.

The previous prime is 155564401. The next prime is 155564447. The reversal of 155564420 is 24465551.

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, 353336 + ... + 353775.

It is an arithmetic number, because the mean of its divisors is an integer number (14849352).

Almost surely, 2^155564420 is an apocalyptic number.

155564420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155564420 is an abundant number, since it is smaller than the sum of its proper divisors (200820028).

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

155564420 is a wasteful number, since it uses less digits than its factorization.

155564420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707131 (or 707129 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 32.

The square root of 155564420 is about 12472.5466525485. The cubic root of 155564420 is about 537.8197643012.

The spelling of 155564420 in words is "one hundred fifty-five million, five hundred sixty-four thousand, four hundred twenty".