78449458 has 32 divisors (see below), whose sum is σ = 133094016. Its totient is φ = 34476288.

The previous prime is 78449453. The next prime is 78449489. The reversal of 78449458 is 85494487.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (78449453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32460 + ... + 34792.

It is an arithmetic number, because the mean of its divisors is an integer number (4159188).

Almost surely, 2^78449458 is an apocalyptic number.

78449458 is a deficient number, since it is larger than the sum of its proper divisors (54644558).

78449458 is a wasteful number, since it uses less digits than its factorization.

78449458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2418.

The product of its digits is 1290240, while the sum is 49.

The square root of 78449458 is about 8857.1698640141. The cubic root of 78449458 is about 428.0849723566.

The spelling of 78449458 in words is "seventy-eight million, four hundred forty-nine thousand, four hundred fifty-eight".