33978857 has 6 divisors (see below), whose sum is σ = 37348794. Its totient is φ = 30889760.

The previous prime is 33978851. The next prime is 33978863. The reversal of 33978857 is 75887933.

33978857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (33978851) and next prime (33978863).

It can be written as a sum of positive squares in only one way, i.e., 33223696 + 755161 = 5764^2 + 869^2 .

It is a de Polignac number, because none of the positive numbers 2^k-33978857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33978851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 140288 + ... + 140529.

It is an arithmetic number, because the mean of its divisors is an integer number (6224799).

Almost surely, 2^33978857 is an apocalyptic number.

It is an amenable number.

33978857 is a deficient number, since it is larger than the sum of its proper divisors (3369937).

33978857 is a wasteful number, since it uses less digits than its factorization.

33978857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280839 (or 280828 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 50.

The square root of 33978857 is about 5829.1386156104. The cubic root of 33978857 is about 323.8940141325.

The spelling of 33978857 in words is "thirty-three million, nine hundred seventy-eight thousand, eight hundred fifty-seven".