78090436 has 12 divisors (see below), whose sum is σ = 138530812. Its totient is φ = 38510208.

The previous prime is 78090433. The next prime is 78090449. The reversal of 78090436 is 63409087.

It can be written as a sum of positive squares in 2 ways, for example, as 67240000 + 10850436 = 8200^2 + 3294^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 78090395 and 78090404.

It is not an unprimeable number, because it can be changed into a prime (78090433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133425 + ... + 134008.

Almost surely, 2^78090436 is an apocalyptic number.

It is an amenable number.

78090436 is a deficient number, since it is larger than the sum of its proper divisors (60440376).

78090436 is a wasteful number, since it uses less digits than its factorization.

78090436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267510 (or 267508 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 78090436 is about 8836.8793134228. The cubic root of 78090436 is about 427.4309335204.

The spelling of 78090436 in words is "seventy-eight million, ninety thousand, four hundred thirty-six".