155072720 has 80 divisors (see below), whose sum is σ = 395278272. Its totient is φ = 56110080.

The previous prime is 155072719. The next prime is 155072741. The reversal of 155072720 is 27270551.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 275159 + ... + 275721.

Almost surely, 2^155072720 is an apocalyptic number.

155072720 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 155072720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197639136).

155072720 is an abundant number, since it is smaller than the sum of its proper divisors (240205552).

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

155072720 is a wasteful number, since it uses less digits than its factorization.

155072720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900 (or 894 counting only the distinct ones).

The product of its (nonzero) digits is 4900, while the sum is 29.

The square root of 155072720 is about 12452.8197610019. The cubic root of 155072720 is about 537.2525285882.

The spelling of 155072720 in words is "one hundred fifty-five million, seventy-two thousand, seven hundred twenty".