78436426 has 4 divisors (see below), whose sum is σ = 117654642. Its totient is φ = 39218212.

The previous prime is 78436363. The next prime is 78436439. The reversal of 78436426 is 62463487.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62463487 = 359 ⋅173993.

It can be written as a sum of positive squares in only one way, i.e., 70308225 + 8128201 = 8385^2 + 2851^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19609105 + ... + 19609108.

Almost surely, 2^78436426 is an apocalyptic number.

78436426 is a deficient number, since it is larger than the sum of its proper divisors (39218216).

78436426 is a wasteful number, since it uses less digits than its factorization.

78436426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39218215.

The product of its digits is 193536, while the sum is 40.

The square root of 78436426 is about 8856.4341582829. The cubic root of 78436426 is about 428.0612665956.

The spelling of 78436426 in words is "seventy-eight million, four hundred thirty-six thousand, four hundred twenty-six".