32991138 has 24 divisors (see below), whose sum is σ = 74129328. Its totient is φ = 10996884.

The previous prime is 32991137. The next prime is 32991149. The reversal of 32991138 is 83119923.

It is not an unprimeable number, because it can be changed into a prime (32991137) 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, 33456 + ... + 34427.

It is an arithmetic number, because the mean of its divisors is an integer number (3088722).

Almost surely, 2^32991138 is an apocalyptic number.

32991138 is an abundant number, since it is smaller than the sum of its proper divisors (41138190).

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

32991138 is an equidigital number, since it uses as much as digits as its factorization.

32991138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67900 (or 67888 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 32991138 is about 5743.7912566527. The cubic root of 32991138 is about 320.7247181369.

The spelling of 32991138 in words is "thirty-two million, nine hundred ninety-one thousand, one hundred thirty-eight".