78484390 has 16 divisors (see below), whose sum is σ = 141776208. Its totient is φ = 31281696.

The previous prime is 78484387. The next prime is 78484397. The reversal of 78484390 is 9348487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78484397) 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, 11037 + ... + 16696.

It is an arithmetic number, because the mean of its divisors is an integer number (8861013).

Almost surely, 2^78484390 is an apocalyptic number.

78484390 is a deficient number, since it is larger than the sum of its proper divisors (63291818).

78484390 is a wasteful number, since it uses less digits than its factorization.

78484390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28023.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 78484390 is about 8859.1416062731. The cubic root of 78484390 is about 428.1485021996.

The spelling of 78484390 in words is "seventy-eight million, four hundred eighty-four thousand, three hundred ninety".