33243978 has 16 divisors (see below), whose sum is σ = 66749760. Its totient is φ = 11037696.

The previous prime is 33243967. The next prime is 33243983. The reversal of 33243978 is 87934233.

It is a super-2 number, since 2×33243978² = 2210324146528968, which contains 22 as substring.

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, 9238 + ... + 12321.

It is an arithmetic number, because the mean of its divisors is an integer number (4171860).

Almost surely, 2^33243978 is an apocalyptic number.

33243978 is an abundant number, since it is smaller than the sum of its proper divisors (33505782).

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

33243978 is a wasteful number, since it uses less digits than its factorization.

33243978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21821.

The product of its digits is 108864, while the sum is 39.

The square root of 33243978 is about 5765.7591000665. The cubic root of 33243978 is about 321.5419654382.

The spelling of 33243978 in words is "thirty-three million, two hundred forty-three thousand, nine hundred seventy-eight".