155136720 has 40 divisors (see below), whose sum is σ = 480924576. Its totient is φ = 41369728.

The previous prime is 155136719. The next prime is 155136749. The reversal of 155136720 is 27631551.

155136720 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

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, 322962 + ... + 323441.

Almost surely, 2^155136720 is an apocalyptic number.

155136720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155136720 is an abundant number, since it is smaller than the sum of its proper divisors (325787856).

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

155136720 is a wasteful number, since it uses less digits than its factorization.

155136720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646419 (or 646413 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 30.

The square root of 155136720 is about 12455.3891950432. The cubic root of 155136720 is about 537.3264281812.

The spelling of 155136720 in words is "one hundred fifty-five million, one hundred thirty-six thousand, seven hundred twenty".