7661790 has 56 divisors (see below), whose sum is σ = 20697048. Its totient is φ = 2041200.

The previous prime is 7661789. The next prime is 7661803. The reversal of 7661790 is 971667.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 6765 + ... + 7815.

Almost surely, 2^7661790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7661790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10348524).

7661790 is an abundant number, since it is smaller than the sum of its proper divisors (13035258).

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

7661790 is a wasteful number, since it uses less digits than its factorization.

7661790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076 (or 1061 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 36.

The square root of 7661790 is about 2767.9938583747. The cubic root of 7661790 is about 197.1409060028.

It can be divided in two parts, 766 and 1790, that added together give a triangular number (2556 = T₇₁).

The spelling of 7661790 in words is "seven million, six hundred sixty-one thousand, seven hundred ninety".