7640690 has 16 divisors (see below), whose sum is σ = 13896792. Its totient is φ = 3024384.

The previous prime is 7640683. The next prime is 7640707. The reversal of 7640690 is 960467.

It can be written as a sum of positive squares in 4 ways, for example, as 4609609 + 3031081 = 2147^2 + 1741^2 .

It is a super-2 number, since 2×7640690² = 116760287352200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

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, 2969 + ... + 4908.

Almost surely, 2^7640690 is an apocalyptic number.

7640690 is a deficient number, since it is larger than the sum of its proper divisors (6256102).

7640690 is a wasteful number, since it uses less digits than its factorization.

7640690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7981.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 7640690 is about 2764.1798060184. The cubic root of 7640690 is about 196.9597691559.

The spelling of 7640690 in words is "seven million, six hundred forty thousand, six hundred ninety".