155790720 has 384 divisors, whose sum is σ = 598609440. Its totient is φ = 37158912.

The previous prime is 155790659. The next prime is 155790721. The reversal of 155790720 is 27097551.

155790720 is a `hidden beast` number, since 15 + 579 + 0 + 72 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

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

It is a zygodrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155790721) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3623019 + ... + 3623061.

Almost surely, 2^155790720 is an apocalyptic number.

155790720 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 155790720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (299304720).

155790720 is an abundant number, since it is smaller than the sum of its proper divisors (442818720).

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

155790720 is a wasteful number, since it uses less digits than its factorization.

155790720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 22050, while the sum is 36.

The square root of 155790720 is about 12481.6152800829. The cubic root of 155790720 is about 538.0804272551.

The spelling of 155790720 in words is "one hundred fifty-five million, seven hundred ninety thousand, seven hundred twenty".