7661990 has 32 divisors (see below), whose sum is σ = 16450560. Its totient is φ = 2512224.

The previous prime is 7661989. The next prime is 7661993. The reversal of 7661990 is 991667.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7661993) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 770 + ... + 3989.

It is an arithmetic number, because the mean of its divisors is an integer number (514080).

Almost surely, 2^7661990 is an apocalyptic number.

7661990 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

7661990 is an abundant number, since it is smaller than the sum of its proper divisors (8788570).

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

7661990 is a wasteful number, since it uses less digits than its factorization.

7661990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4796.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 7661990 is about 2768.0299853867. The cubic root of 7661990 is about 197.1426213478.

The spelling of 7661990 in words is "seven million, six hundred sixty-one thousand, nine hundred ninety".