78889490 has 16 divisors (see below), whose sum is σ = 144408960. Its totient is φ = 31020720.

The previous prime is 78889429. The next prime is 78889507. The reversal of 78889490 is 9498887.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66266 + ... + 67445.

It is an arithmetic number, because the mean of its divisors is an integer number (9025560).

Almost surely, 2^78889490 is an apocalyptic number.

78889490 is a deficient number, since it is larger than the sum of its proper divisors (65519470).

78889490 is a wasteful number, since it uses less digits than its factorization.

78889490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133777.

The product of its (nonzero) digits is 1161216, while the sum is 53.

The square root of 78889490 is about 8881.9755685320. The cubic root of 78889490 is about 428.8838730605.

The spelling of 78889490 in words is "seventy-eight million, eight hundred eighty-nine thousand, four hundred ninety".