78626290 has 16 divisors (see below), whose sum is σ = 141649560. Its totient is φ = 31423360.

The previous prime is 78626281. The next prime is 78626297. The reversal of 78626290 is 9262687.

It can be written as a sum of positive squares in 4 ways, for example, as 33212169 + 45414121 = 5763^2 + 6739^2 .

It is not an unprimeable number, because it can be changed into a prime (78626297) 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, 12156 + ... + 17464.

Almost surely, 2^78626290 is an apocalyptic number.

78626290 is a deficient number, since it is larger than the sum of its proper divisors (63023270).

78626290 is a wasteful number, since it uses less digits than its factorization.

78626290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6797.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 78626290 is about 8867.1466662055. The cubic root of 78626290 is about 428.4063780845.

The spelling of 78626290 in words is "seventy-eight million, six hundred twenty-six thousand, two hundred ninety".