155623680 has 360 divisors, whose sum is σ = 593577600. Its totient is φ = 38817792.

The previous prime is 155623669. The next prime is 155623687. The reversal of 155623680 is 86326551.

155623680 is a `hidden beast` number, since 1 + 556 + 23 + 6 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (360).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is not an unprimeable number, because it can be changed into a prime (155623687) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1969881 + ... + 1969959.

Almost surely, 2^155623680 is an apocalyptic number.

155623680 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 155623680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (296788800).

155623680 is an abundant number, since it is smaller than the sum of its proper divisors (437953920).

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

155623680 is an equidigital number, since it uses as much as digits as its factorization.

155623680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131 (or 108 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 155623680 is about 12474.9220438446. The cubic root of 155623680 is about 537.8880471668. Note that the first 3 decimals are identical.

The spelling of 155623680 in words is "one hundred fifty-five million, six hundred twenty-three thousand, six hundred eighty".