78209433 has 12 divisors (see below), whose sum is σ = 116865060. Its totient is φ = 50341536.

The previous prime is 78209431. The next prime is 78209437. The reversal of 78209433 is 33490287.

It can be written as a sum of positive squares in 2 ways, for example, as 44997264 + 33212169 = 6708^2 + 5763^2 .

It is not a de Polignac number, because 78209433 - 2¹ = 78209431 is a prime.

It is a super-2 number, since 2×78209433² = 12233430820362978, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78209431) 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, 149566 + ... + 150087.

It is an arithmetic number, because the mean of its divisors is an integer number (9738755).

Almost surely, 2^78209433 is an apocalyptic number.

It is an amenable number.

78209433 is a deficient number, since it is larger than the sum of its proper divisors (38655627).

78209433 is a wasteful number, since it uses less digits than its factorization.

78209433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299688 (or 299685 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 78209433 is about 8843.6097268027. The cubic root of 78209433 is about 427.6479348488.

The spelling of 78209433 in words is "seventy-eight million, two hundred nine thousand, four hundred thirty-three".