10721408 has 16 divisors (see below), whose sum is σ = 21359310. Its totient is φ = 5360640.

The previous prime is 10721401. The next prime is 10721413. The reversal of 10721408 is 80412701.

It can be written as a sum of positive squares in only one way, i.e., 9784384 + 937024 = 3128^2 + 968^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×10721408² = 229897179004928, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (10721401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41753 + ... + 42008.

Almost surely, 2^10721408 is an apocalyptic number.

It is an amenable number.

10721408 is a deficient number, since it is larger than the sum of its proper divisors (10637902).

10721408 is an frugal number, since it uses more digits than its factorization.

10721408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83775 (or 83763 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 10721408 is about 3274.3561199112. The cubic root of 10721408 is about 220.5044073690.

The spelling of 10721408 in words is "ten million, seven hundred twenty-one thousand, four hundred eight".