7720426 has 16 divisors (see below), whose sum is σ = 13662720. Its totient is φ = 3201840.

The previous prime is 7720399. The next prime is 7720429. The reversal of 7720426 is 6240277.

It is a junction number, because it is equal to n+sod(n) for n = 7720394 and 7720403.

It is not an unprimeable number, because it can be changed into a prime (7720429) 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, 8461 + ... + 9328.

It is an arithmetic number, because the mean of its divisors is an integer number (853920).

Almost surely, 2^7720426 is an apocalyptic number.

7720426 is a deficient number, since it is larger than the sum of its proper divisors (5942294).

7720426 is a wasteful number, since it uses less digits than its factorization.

7720426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17829.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 7720426 is about 2778.5654572099. The cubic root of 7720426 is about 197.6425377068.

It can be divided in two parts, 77 and 20426, that added together give a triangular number (20503 = T₂₀₂).

The spelling of 7720426 in words is "seven million, seven hundred twenty thousand, four hundred twenty-six".