78238436 has 6 divisors (see below), whose sum is σ = 136917270. Its totient is φ = 39119216.

The previous prime is 78238411. The next prime is 78238483. The reversal of 78238436 is 63483287.

It can be written as a sum of positive squares in only one way, i.e., 54169600 + 24068836 = 7360^2 + 4906^2 .

It is a super-2 number, since 2×78238436² = 12242505735452192, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78238393 and 78238402.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 9779801 + ... + 9779808.

It is an arithmetic number, because the mean of its divisors is an integer number (22819545).

Almost surely, 2^78238436 is an apocalyptic number.

It is an amenable number.

78238436 is a deficient number, since it is larger than the sum of its proper divisors (58678834).

78238436 is a wasteful number, since it uses less digits than its factorization.

78238436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19559613 (or 19559611 counting only the distinct ones).

The product of its digits is 193536, while the sum is 41.

The square root of 78238436 is about 8845.2493464006. The cubic root of 78238436 is about 427.7007909631.

The spelling of 78238436 in words is "seventy-eight million, two hundred thirty-eight thousand, four hundred thirty-six".