78398254 has 16 divisors (see below), whose sum is σ = 135835056. Its totient is φ = 33539200.

The previous prime is 78398251. The next prime is 78398263. The reversal of 78398254 is 45289387.

It is a super-2 number, since 2×78398254² = 12292572460497032, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78398251) 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, 104437 + ... + 105184.

It is an arithmetic number, because the mean of its divisors is an integer number (8489691).

Almost surely, 2^78398254 is an apocalyptic number.

78398254 is a deficient number, since it is larger than the sum of its proper divisors (57436802).

78398254 is a wasteful number, since it uses less digits than its factorization.

78398254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209651.

The product of its digits is 483840, while the sum is 46.

The square root of 78398254 is about 8854.2788526226. The cubic root of 78398254 is about 427.9918149947.

The spelling of 78398254 in words is "seventy-eight million, three hundred ninety-eight thousand, two hundred fifty-four".