7789640 has 32 divisors (see below), whose sum is σ = 18290880. Its totient is φ = 2980032.

The previous prime is 7789627. The next prime is 7789657. The reversal of 7789640 is 469877.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

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, 3314 + ... + 5153.

It is an arithmetic number, because the mean of its divisors is an integer number (571590).

Almost surely, 2^7789640 is an apocalyptic number.

It is an amenable number.

7789640 is an abundant number, since it is smaller than the sum of its proper divisors (10501240).

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

7789640 is a wasteful number, since it uses less digits than its factorization.

7789640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8501 (or 8497 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 7789640 is about 2790.9926549527. The cubic root of 7789640 is about 198.2314064851.

Adding to 7789640 its sum of digits (41), we get a square (7789681 = 2791²).

The spelling of 7789640 in words is "seven million, seven hundred eighty-nine thousand, six hundred forty".