33988978321 has 9 divisors (see below), whose sum is σ = 34329525321. Its totient is φ = 33651782052.

The previous prime is 33988978319. The next prime is 33988978333. The reversal of 33988978321 is 12387988933.

The square root of 33988978321 is 184361.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 33988978321 - 2¹ = 33988978319 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 33988978321.

It is not an unprimeable number, because it can be changed into a prime (33988970321) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 19725766 + ... + 19727488.

Almost surely, 2^33988978321 is an apocalyptic number.

33988978321 is the 184361-st square number.

33988978321 is the 92181-st centered octagonal number.

It is an amenable number.

33988978321 is a deficient number, since it is larger than the sum of its proper divisors (340547000).

33988978321 is an frugal number, since it uses more digits than its factorization.

33988978321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3660 (or 1830 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 61.

The spelling of 33988978321 in words is "thirty-three billion, nine hundred eighty-eight million, nine hundred seventy-eight thousand, three hundred twenty-one".