155673640 has 16 divisors (see below), whose sum is σ = 350265780. Its totient is φ = 62269440.

The previous prime is 155673619. The next prime is 155673643. The reversal of 155673640 is 46376551.

It can be written as a sum of positive squares in 2 ways, for example, as 155401156 + 272484 = 12466^2 + 522^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 155673640.

It is not an unprimeable number, because it can be changed into a prime (155673643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1945881 + ... + 1945960.

Almost surely, 2^155673640 is an apocalyptic number.

155673640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155673640 is an abundant number, since it is smaller than the sum of its proper divisors (194592140).

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

155673640 is a wasteful number, since it uses less digits than its factorization.

155673640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3891852 (or 3891848 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 37.

The square root of 155673640 is about 12476.9243004837. The cubic root of 155673640 is about 537.9456005581.

The spelling of 155673640 in words is "one hundred fifty-five million, six hundred seventy-three thousand, six hundred forty".