7720872 has 32 divisors (see below), whose sum is σ = 19375200. Its totient is φ = 2563904.

The previous prime is 7720871. The next prime is 7720877. The reversal of 7720872 is 2780277.

It is a happy number.

It is a super-2 number, since 2×7720872² = 119223728880768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7720871) 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, 8923 + ... + 9749.

It is an arithmetic number, because the mean of its divisors is an integer number (605475).

Almost surely, 2^7720872 is an apocalyptic number.

It is an amenable number.

7720872 is an abundant number, since it is smaller than the sum of its proper divisors (11654328).

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

7720872 is a wasteful number, since it uses less digits than its factorization.

7720872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225 (or 1221 counting only the distinct ones).

The product of its (nonzero) digits is 10976, while the sum is 33.

The square root of 7720872 is about 2778.6457132927. The cubic root of 7720872 is about 197.6463434931.

The spelling of 7720872 in words is "seven million, seven hundred twenty thousand, eight hundred seventy-two".