155428890 has 16 divisors (see below), whose sum is σ = 373029408. Its totient is φ = 41447696.

The previous prime is 155428879. The next prime is 155428919. The reversal of 155428890 is 98824551.

It is a happy number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2590452 + ... + 2590511.

It is an arithmetic number, because the mean of its divisors is an integer number (23314338).

Almost surely, 2^155428890 is an apocalyptic number.

155428890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155428890 is an abundant number, since it is smaller than the sum of its proper divisors (217600518).

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

155428890 is a wasteful number, since it uses less digits than its factorization.

155428890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5180973.

The product of its (nonzero) digits is 115200, while the sum is 42.

The square root of 155428890 is about 12467.1123360624. The cubic root of 155428890 is about 537.6635334383.

The spelling of 155428890 in words is "one hundred fifty-five million, four hundred twenty-eight thousand, eight hundred ninety".