165072400 has 60 divisors (see below), whose sum is σ = 397950100. Its totient is φ = 65802240.

The previous prime is 165072377. The next prime is 165072421. The reversal of 165072400 is 4270561.

It can be written as a sum of positive squares in 6 ways, for example, as 1296 + 165071104 = 36^2 + 12848^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 163096 + ... + 164104.

Almost surely, 2^165072400 is an apocalyptic number.

165072400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165072400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198975050).

165072400 is an abundant number, since it is smaller than the sum of its proper divisors (232877700).

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

165072400 is a wasteful number, since it uses less digits than its factorization.

165072400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1436 (or 1425 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 165072400 is about 12848.0504357665. The cubic root of 165072400 is about 548.5608657337.

The spelling of 165072400 in words is "one hundred sixty-five million, seventy-two thousand, four hundred".