165528890 has 16 divisors (see below), whose sum is σ = 305219880. Its totient is φ = 64596480.

The previous prime is 165528889. The next prime is 165528941. The reversal of 165528890 is 98825561.

It can be written as a sum of positive squares in 4 ways, for example, as 87965641 + 77563249 = 9379^2 + 8807^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201455 + ... + 202274.

Almost surely, 2^165528890 is an apocalyptic number.

165528890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165528890 is a deficient number, since it is larger than the sum of its proper divisors (139690990).

165528890 is a wasteful number, since it uses less digits than its factorization.

165528890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403777.

The product of its (nonzero) digits is 172800, while the sum is 44.

The square root of 165528890 is about 12865.8031230079. The cubic root of 165528890 is about 549.0660623906.

The spelling of 165528890 in words is "one hundred sixty-five million, five hundred twenty-eight thousand, eight hundred ninety".