155604240 has 400 divisors, whose sum is σ = 615764160. Its totient is φ = 36080640.

The previous prime is 155604191. The next prime is 155604257. The reversal of 155604240 is 42406551.

155604240 is a `hidden beast` number, since 1 + 55 + 604 + 2 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2637331 + ... + 2637389.

Almost surely, 2^155604240 is an apocalyptic number.

155604240 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 155604240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (307882080).

155604240 is an abundant number, since it is smaller than the sum of its proper divisors (460159920).

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

155604240 is a wasteful number, since it uses less digits than its factorization.

155604240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 155604240 is about 12474.1428563248. The cubic root of 155604240 is about 537.8656491636.

The spelling of 155604240 in words is "one hundred fifty-five million, six hundred four thousand, two hundred forty".