155623890 has 32 divisors (see below), whose sum is σ = 377354880. Its totient is φ = 41071104.

The previous prime is 155623877. The next prime is 155623891. The reversal of 155623890 is 98326551.

It is not an unprimeable number, because it can be changed into a prime (155623891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23830 + ... + 29649.

It is an arithmetic number, because the mean of its divisors is an integer number (11792340).

Almost surely, 2^155623890 is an apocalyptic number.

155623890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155623890 is an abundant number, since it is smaller than the sum of its proper divisors (221730990).

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

155623890 is a wasteful number, since it uses less digits than its factorization.

155623890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53586.

The product of its (nonzero) digits is 64800, while the sum is 39.

The square root of 155623890 is about 12474.9304607280. The cubic root of 155623890 is about 537.8882891103. Note that the first 3 decimals are identical.

The spelling of 155623890 in words is "one hundred fifty-five million, six hundred twenty-three thousand, eight hundred ninety".