155677640 has 48 divisors (see below), whose sum is σ = 369714780. Its totient is φ = 58988160.

The previous prime is 155677609. The next prime is 155677651. The reversal of 155677640 is 46776551.

155677640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 150651076 + 5026564 = 12274^2 + 2242^2 .

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, 9050 + ... + 19830.

Almost surely, 2^155677640 is an apocalyptic number.

155677640 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 155677640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184857390).

155677640 is an abundant number, since it is smaller than the sum of its proper divisors (214037140).

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

155677640 is a wasteful number, since it uses less digits than its factorization.

155677640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10830 (or 10807 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 41.

The square root of 155677640 is about 12477.0845953692. The cubic root of 155677640 is about 537.9502079834.

The spelling of 155677640 in words is "one hundred fifty-five million, six hundred seventy-seven thousand, six hundred forty".