78269458 has 4 divisors (see below), whose sum is σ = 117404190. Its totient is φ = 39134728.

The previous prime is 78269453. The next prime is 78269489. The reversal of 78269458 is 85496287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85496287 = 5107 ⋅16741.

It can be written as a sum of positive squares in only one way, i.e., 78269409 + 49 = 8847^2 + 7^2 .

It is a super-2 number, since 2×78269458² = 12252216111227528, which contains 22 as substring.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (78269453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19567363 + ... + 19567366.

Almost surely, 2^78269458 is an apocalyptic number.

78269458 is a deficient number, since it is larger than the sum of its proper divisors (39134732).

78269458 is a wasteful number, since it uses less digits than its factorization.

78269458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39134731.

The product of its digits is 967680, while the sum is 49.

The square root of 78269458 is about 8847.0027692999. The cubic root of 78269458 is about 427.7573121197.

Subtracting from 78269458 its sum of digits (49), we obtain a square (78269409 = 8847²).

The spelling of 78269458 in words is "seventy-eight million, two hundred sixty-nine thousand, four hundred fifty-eight".