78490084 has 6 divisors (see below), whose sum is σ = 137357654. Its totient is φ = 39245040.

The previous prime is 78490081. The next prime is 78490123. The reversal of 78490084 is 48009487.

It can be written as a sum of positive squares in only one way, i.e., 64352484 + 14137600 = 8022^2 + 3760^2 .

It is not an unprimeable number, because it can be changed into a prime (78490081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9811257 + ... + 9811264.

Almost surely, 2^78490084 is an apocalyptic number.

It is an amenable number.

78490084 is a deficient number, since it is larger than the sum of its proper divisors (58867570).

78490084 is a wasteful number, since it uses less digits than its factorization.

78490084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19622525 (or 19622523 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 78490084 is about 8859.4629634081. The cubic root of 78490084 is about 428.1588559299.

The spelling of 78490084 in words is "seventy-eight million, four hundred ninety thousand, eighty-four".