155079720 has 96 divisors (see below), whose sum is σ = 509319720. Its totient is φ = 40919040.

The previous prime is 155079709. The next prime is 155079721. The reversal of 155079720 is 27970551.

It can be written as a sum of positive squares in 4 ways, for example, as 113167044 + 41912676 = 10638^2 + 6474^2 .

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 (155079721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32700 + ... + 37140.

Almost surely, 2^155079720 is an apocalyptic number.

155079720 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 155079720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254659860).

155079720 is an abundant number, since it is smaller than the sum of its proper divisors (354240000).

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

155079720 is a wasteful number, since it uses less digits than its factorization.

155079720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4555 (or 4548 counting only the distinct ones).

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

The square root of 155079720 is about 12453.1008186716. The cubic root of 155079720 is about 537.2606123464.

The spelling of 155079720 in words is "one hundred fifty-five million, seventy-nine thousand, seven hundred twenty".