78297236 has 12 divisors (see below), whose sum is σ = 138433428. Its totient is φ = 38744832.

The previous prime is 78297229. The next prime is 78297239. The reversal of 78297236 is 63279287.

78297236 = 850² + 851² + ... + 946².

It can be written as a sum of positive squares in 2 ways, for example, as 63520900 + 14776336 = 7970^2 + 3844^2 .

It is a super-2 number, since 2×78297236² = 12260914330479392, which contains 22 as substring.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78297239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100511 + ... + 101286.

It is an arithmetic number, because the mean of its divisors is an integer number (11536119).

Almost surely, 2^78297236 is an apocalyptic number.

It is an amenable number.

78297236 is a deficient number, since it is larger than the sum of its proper divisors (60136192).

78297236 is a wasteful number, since it uses less digits than its factorization.

78297236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201898 (or 201896 counting only the distinct ones).

The product of its digits is 254016, while the sum is 44.

The square root of 78297236 is about 8848.5725402463. The cubic root of 78297236 is about 427.8079101330.

The spelling of 78297236 in words is "seventy-eight million, two hundred ninety-seven thousand, two hundred thirty-six".