9977988 has 24 divisors (see below), whose sum is σ = 23390080. Its totient is φ = 3310560.

The previous prime is 9977977. The next prime is 9977993. The reversal of 9977988 is 8897799.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 933 + ... + 4563.

Almost surely, 2^9977988 is an apocalyptic number.

It is an amenable number.

9977988 is an abundant number, since it is smaller than the sum of its proper divisors (13412092).

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

9977988 is a wasteful number, since it uses less digits than its factorization.

9977988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3867 (or 3865 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 57.

The square root of 9977988 is about 3158.7953399991. The cubic root of 9977988 is about 215.2852748193.

It can be divided in two parts, 99 and 77988, that added together give a palindrome (78087).

The spelling of 9977988 in words is "nine million, nine hundred seventy-seven thousand, nine hundred eighty-eight".