165428890 has 16 divisors (see below), whose sum is σ = 324842400. Its totient is φ = 60155920.

The previous prime is 165428881. The next prime is 165428897. The reversal of 165428890 is 98824561.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (165428897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 751840 + ... + 752059.

It is an arithmetic number, because the mean of its divisors is an integer number (20302650).

Almost surely, 2^165428890 is an apocalyptic number.

165428890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165428890 is a deficient number, since it is larger than the sum of its proper divisors (159413510).

165428890 is a wasteful number, since it uses less digits than its factorization.

165428890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1503917.

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 165428890 is about 12861.9162646940. The cubic root of 165428890 is about 548.9554720948.

The spelling of 165428890 in words is "one hundred sixty-five million, four hundred twenty-eight thousand, eight hundred ninety".