109621720 has 32 divisors (see below), whose sum is σ = 265623120. Its totient is φ = 40475520.

The previous prime is 109621667. The next prime is 109621723. The reversal of 109621720 is 27126901.

It is a happy number.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109621723) 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, 104886 + ... + 105925.

Almost surely, 2^109621720 is an apocalyptic number.

109621720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

109621720 is an abundant number, since it is smaller than the sum of its proper divisors (156001400).

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

109621720 is a wasteful number, since it uses less digits than its factorization.

109621720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210835 (or 210831 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 109621720 is about 10470.0391594301. The cubic root of 109621720 is about 478.5921129928.

The spelling of 109621720 in words is "one hundred nine million, six hundred twenty-one thousand, seven hundred twenty".