165800730 has 16 divisors (see below), whose sum is σ = 397921824. Its totient is φ = 44213520.

The previous prime is 165800693. The next prime is 165800759. The reversal of 165800730 is 37008561.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 5526691 = 165800730 / (1 + 6 + 5 + 8 + 0 + 0 + 7 + 3 + 0).

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, 2763316 + ... + 2763375.

It is an arithmetic number, because the mean of its divisors is an integer number (24870114).

Almost surely, 2^165800730 is an apocalyptic number.

165800730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165800730 is an abundant number, since it is smaller than the sum of its proper divisors (232121094).

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

165800730 is a wasteful number, since it uses less digits than its factorization.

165800730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5526701.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 165800730 is about 12876.3632288003. The cubic root of 165800730 is about 549.3664661176.

The spelling of 165800730 in words is "one hundred sixty-five million, eight hundred thousand, seven hundred thirty".