7661690 has 8 divisors (see below), whose sum is σ = 13791060. Its totient is φ = 3064672.

The previous prime is 7661677. The next prime is 7661707. The reversal of 7661690 is 961667.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7524049 + 137641 = 2743^2 + 371^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×7661690² = 117402987312200, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 7661690.

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 3 ways as a sum of consecutive naturals, for example, 383075 + ... + 383094.

Almost surely, 2^7661690 is an apocalyptic number.

7661690 is a deficient number, since it is larger than the sum of its proper divisors (6129370).

7661690 is a wasteful number, since it uses less digits than its factorization.

7661690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766176.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 7661690 is about 2767.9757946919. The cubic root of 7661690 is about 197.1400483192.

Subtracting from 7661690 its sum of digits (35), we obtain a triangular number (7661655 = T₃₉₁₄).

The spelling of 7661690 in words is "seven million, six hundred sixty-one thousand, six hundred ninety".