155272393728 has 66 divisors (see below), whose sum is σ = 448345693874. Its totient is φ = 51757461504.

The previous prime is 155272393721. The next prime is 155272393739. The reversal of 155272393728 is 827393272551.

155272393728 is a `hidden beast` number, since 1 + 5 + 527 + 2 + 3 + 93 + 7 + 28 = 666.

It can be written as a sum of positive squares in only one way, i.e., 95673913344 + 59598480384 = 309312^2 + 244128^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155272393721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8414851 + ... + 8433282.

Almost surely, 2^155272393728 is an apocalyptic number.

155272393728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

155272393728 is an abundant number, since it is smaller than the sum of its proper divisors (293073300146).

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

155272393728 is a wasteful number, since it uses less digits than its factorization.

155272393728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16848159 (or 16848138 counting only the distinct ones).

The product of its digits is 6350400, while the sum is 54.

The spelling of 155272393728 in words is "one hundred fifty-five billion, two hundred seventy-two million, three hundred ninety-three thousand, seven hundred twenty-eight".