155777272 has 48 divisors (see below), whose sum is σ = 340960320. Its totient is φ = 66528000.

The previous prime is 155777269. The next prime is 155777309. The reversal of 155777272 is 272777551.

155777272 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 156697 + ... + 157687.

It is an arithmetic number, because the mean of its divisors is an integer number (7103340).

Almost surely, 2^155777272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155777272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170480160).

155777272 is an abundant number, since it is smaller than the sum of its proper divisors (185183048).

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

155777272 is a wasteful number, since it uses less digits than its factorization.

155777272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1412 (or 1401 counting only the distinct ones).

The product of its digits is 240100, while the sum is 43.

The square root of 155777272 is about 12481.0765561309. The cubic root of 155777272 is about 538.0649442751.

The spelling of 155777272 in words is "one hundred fifty-five million, seven hundred seventy-seven thousand, two hundred seventy-two".