10721808 has 50 divisors (see below), whose sum is σ = 31035774. Its totient is φ = 3573504.

The previous prime is 10721807. The next prime is 10721819. The reversal of 10721808 is 80812701.

It can be written as a sum of positive squares in only one way, i.e., 10036224 + 685584 = 3168^2 + 828^2 .

It is a super-2 number, since 2×10721808² = 229914333577728, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (10721803) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2841 + ... + 5432.

Almost surely, 2^10721808 is an apocalyptic number.

10721808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

10721808 is an abundant number, since it is smaller than the sum of its proper divisors (20313966).

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

10721808 is an equidigital number, since it uses as much as digits as its factorization.

10721808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8293 (or 8278 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 10721808 is about 3274.4172000526. The cubic root of 10721808 is about 220.5071495669.

The spelling of 10721808 in words is "ten million, seven hundred twenty-one thousand, eight hundred eight".