78434458 has 4 divisors (see below), whose sum is σ = 117651690. Its totient is φ = 39217228.

The previous prime is 78434449. The next prime is 78434483. The reversal of 78434458 is 85443487.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85443487 = 7867 ⋅10861.

It can be written as a sum of positive squares in only one way, i.e., 55995289 + 22439169 = 7483^2 + 4737^2 .

It is a super-3 number, since 3×78434458³ (a number of 25 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19608613 + ... + 19608616.

Almost surely, 2^78434458 is an apocalyptic number.

78434458 is a deficient number, since it is larger than the sum of its proper divisors (39217232).

78434458 is a wasteful number, since it uses less digits than its factorization.

78434458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39217231.

The product of its digits is 430080, while the sum is 43.

The square root of 78434458 is about 8856.3230519217. The cubic root of 78434458 is about 428.0576864919.

The spelling of 78434458 in words is "seventy-eight million, four hundred thirty-four thousand, four hundred fifty-eight".