7720772 has 24 divisors (see below), whose sum is σ = 13867896. Its totient is φ = 3760128.

The previous prime is 7720759. The next prime is 7720813. The reversal of 7720772 is 2770277.

It can be written as a sum of positive squares in 4 ways, for example, as 835396 + 6885376 = 914^2 + 2624^2 .

It is a super-2 number, since 2×7720772² = 119220640551968, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39908 + ... + 40100.

It is an arithmetic number, because the mean of its divisors is an integer number (577829).

Almost surely, 2^7720772 is an apocalyptic number.

It is an amenable number.

7720772 is a deficient number, since it is larger than the sum of its proper divisors (6147124).

7720772 is a wasteful number, since it uses less digits than its factorization.

7720772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407 (or 405 counting only the distinct ones).

The product of its (nonzero) digits is 9604, while the sum is 32.

The square root of 7720772 is about 2778.6277188569. The cubic root of 7720772 is about 197.6454901906.

The spelling of 7720772 in words is "seven million, seven hundred twenty thousand, seven hundred seventy-two".