7641990 has 96 divisors (see below), whose sum is σ = 21621600. Its totient is φ = 1866240.

The previous prime is 7641989. The next prime is 7642007. The reversal of 7641990 is 991467.

7641990 is a `hidden beast` number, since 7 + 641 + 9 + 9 + 0 = 666.

It is a super-2 number, since 2×7641990² = 116800022320200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 70056 + ... + 70164.

It is an arithmetic number, because the mean of its divisors is an integer number (225225).

Almost surely, 2^7641990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7641990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10810800).

7641990 is an abundant number, since it is smaller than the sum of its proper divisors (13979610).

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

7641990 is a wasteful number, since it uses less digits than its factorization.

7641990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 7641990 is about 2764.4149471452. The cubic root of 7641990 is about 196.9709388793.

The spelling of 7641990 in words is "seven million, six hundred forty-one thousand, nine hundred ninety".