7721472 has 80 divisors (see below), whose sum is σ = 22489632. Its totient is φ = 2334720.

The previous prime is 7721459. The next prime is 7721477. The reversal of 7721472 is 2741277.

It is a super-2 number, since 2×7721472² = 119242259693568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7721477) 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, 16668 + ... + 17124.

Almost surely, 2^7721472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7721472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11244816).

7721472 is an abundant number, since it is smaller than the sum of its proper divisors (14768160).

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

7721472 is a wasteful number, since it uses less digits than its factorization.

7721472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 473 counting only the distinct ones).

The product of its digits is 5488, while the sum is 30.

The square root of 7721472 is about 2778.7536774605. The cubic root of 7721472 is about 197.6514631538.

The spelling of 7721472 in words is "seven million, seven hundred twenty-one thousand, four hundred seventy-two".