7797640 has 32 divisors (see below), whose sum is σ = 17674560. Its totient is φ = 3096000.

The previous prime is 7797631. The next prime is 7797653. The reversal of 7797640 is 467977.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 7797593 and 7797602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5395 + ... + 6685.

It is an arithmetic number, because the mean of its divisors is an integer number (552330).

Almost surely, 2^7797640 is an apocalyptic number.

It is an amenable number.

7797640 is an abundant number, since it is smaller than the sum of its proper divisors (9876920).

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

7797640 is a wasteful number, since it uses less digits than its factorization.

7797640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1453 (or 1449 counting only the distinct ones).

The product of its (nonzero) digits is 74088, while the sum is 40.

The square root of 7797640 is about 2792.4254690143. The cubic root of 7797640 is about 198.2992448220.

The spelling of 7797640 in words is "seven million, seven hundred ninety-seven thousand, six hundred forty".