78490066 has 8 divisors (see below), whose sum is σ = 121795020. Its totient is φ = 37891728.

The previous prime is 78490057. The next prime is 78490067. The reversal of 78490066 is 66009487.

It can be written as a sum of positive squares in 2 ways, for example, as 68409441 + 10080625 = 8271^2 + 3175^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (78490067) 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, 676581 + ... + 676696.

Almost surely, 2^78490066 is an apocalyptic number.

78490066 is a deficient number, since it is larger than the sum of its proper divisors (43304954).

78490066 is a wasteful number, since it uses less digits than its factorization.

78490066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1353308.

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

The square root of 78490066 is about 8859.4619475451. The cubic root of 78490066 is about 428.1588232002.

The spelling of 78490066 in words is "seventy-eight million, four hundred ninety thousand, sixty-six".