155727720 has 48 divisors (see below), whose sum is σ = 506116260. Its totient is φ = 41527296.

The previous prime is 155727713. The next prime is 155727749. The reversal of 155727720 is 27727551.

155727720 is a `hidden beast` number, since 15 + 572 + 7 + 72 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 138438756 + 17288964 = 11766^2 + 4158^2 .

It is a super-2 number, since 2×155727720² = 48502245552796800, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 215929 + ... + 216648.

Almost surely, 2^155727720 is an apocalyptic number.

155727720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155727720 is an abundant number, since it is smaller than the sum of its proper divisors (350388540).

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

155727720 is a wasteful number, since it uses less digits than its factorization.

155727720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432594 (or 432587 counting only the distinct ones).

The product of its (nonzero) digits is 34300, while the sum is 36.

The square root of 155727720 is about 12479.0913130724. The cubic root of 155727720 is about 538.0078862689.

The spelling of 155727720 in words is "one hundred fifty-five million, seven hundred twenty-seven thousand, seven hundred twenty".