155545920 has 280 divisors, whose sum is σ = 587511144. Its totient is φ = 38928384.

The previous prime is 155545919. The next prime is 155545931. The reversal of 155545920 is 29545551.

155545920 is a `hidden beast` number, since 15 + 5 + 54 + 592 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 26132544 + 129413376 = 5112^2 + 11376^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 440464 + ... + 440816.

Almost surely, 2^155545920 is an apocalyptic number.

155545920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155545920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (293755572).

155545920 is an abundant number, since it is smaller than the sum of its proper divisors (431965224).

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

155545920 is a wasteful number, since it uses less digits than its factorization.

155545920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399 (or 380 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The square root of 155545920 is about 12471.8050016828. The cubic root of 155545920 is about 537.7984439589.

The spelling of 155545920 in words is "one hundred fifty-five million, five hundred forty-five thousand, nine hundred twenty".