78396254 has 4 divisors (see below), whose sum is σ = 117594384. Its totient is φ = 39198126.

The previous prime is 78396247. The next prime is 78396271. The reversal of 78396254 is 45269387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45269387 = 71 ⋅637597.

It is a super-2 number, since 2×78396254² = 12291945282465032, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19599062 + ... + 19599065.

It is an arithmetic number, because the mean of its divisors is an integer number (29398596).

Almost surely, 2^78396254 is an apocalyptic number.

78396254 is a deficient number, since it is larger than the sum of its proper divisors (39198130).

78396254 is a wasteful number, since it uses less digits than its factorization.

78396254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39198129.

The product of its digits is 362880, while the sum is 44.

The square root of 78396254 is about 8854.1659121568. The cubic root of 78396254 is about 427.9881754965.

The spelling of 78396254 in words is "seventy-eight million, three hundred ninety-six thousand, two hundred fifty-four".