78936090 has 16 divisors (see below), whose sum is σ = 189446688. Its totient is φ = 21049616.

The previous prime is 78936079. The next prime is 78936097. The reversal of 78936090 is 9063987.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (78936097) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1315572 + ... + 1315631.

It is an arithmetic number, because the mean of its divisors is an integer number (11840418).

Almost surely, 2^78936090 is an apocalyptic number.

78936090 is an abundant number, since it is smaller than the sum of its proper divisors (110510598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78936090 is a wasteful number, since it uses less digits than its factorization.

78936090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2631213.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 78936090 is about 8884.5984715124. The cubic root of 78936090 is about 428.9683036335.

The spelling of 78936090 in words is "seventy-eight million, nine hundred thirty-six thousand, ninety".