155890090 has 16 divisors (see below), whose sum is σ = 292802688. Its totient is φ = 59644816.

The previous prime is 155890081. The next prime is 155890123. The reversal of 155890090 is 90098551.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 338662 + ... + 339121.

It is an arithmetic number, because the mean of its divisors is an integer number (18300168).

Almost surely, 2^155890090 is an apocalyptic number.

155890090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155890090 is a deficient number, since it is larger than the sum of its proper divisors (136912598).

155890090 is a wasteful number, since it uses less digits than its factorization.

155890090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677813.

The product of its (nonzero) digits is 16200, while the sum is 37.

The square root of 155890090 is about 12485.5953001849. The cubic root of 155890090 is about 538.1948065279.

The spelling of 155890090 in words is "one hundred fifty-five million, eight hundred ninety thousand, ninety".