7661988 has 36 divisors (see below), whose sum is σ = 19456528. Its totient is φ = 2542320.

The previous prime is 7661981. The next prime is 7661989. The reversal of 7661988 is 8891667.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×7661988² = 117412120224288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7661981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11595 + ... + 12237.

Almost surely, 2^7661988 is an apocalyptic number.

It is an amenable number.

7661988 is an abundant number, since it is smaller than the sum of its proper divisors (11794540).

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

7661988 is a wasteful number, since it uses less digits than its factorization.

7661988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984 (or 979 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 7661988 is about 2768.0296241189. The cubic root of 7661988 is about 197.1426041945.

It can be divided in two parts, 7661 and 988, that added together give a square (8649 = 93²).

The spelling of 7661988 in words is "seven million, six hundred sixty-one thousand, nine hundred eighty-eight".