78542474 has 4 divisors (see below), whose sum is σ = 117813714. Its totient is φ = 39271236.

The previous prime is 78542473. The next prime is 78542479. The reversal of 78542474 is 47424587.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 53392249 + 25150225 = 7307^2 + 5015^2 .

It is not an unprimeable number, because it can be changed into a prime (78542473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19635617 + ... + 19635620.

Almost surely, 2^78542474 is an apocalyptic number.

78542474 is a deficient number, since it is larger than the sum of its proper divisors (39271240).

78542474 is a wasteful number, since it uses less digits than its factorization.

78542474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39271239.

The product of its digits is 250880, while the sum is 41.

The square root of 78542474 is about 8862.4191956824. The cubic root of 78542474 is about 428.2540962134.

The spelling of 78542474 in words is "seventy-eight million, five hundred forty-two thousand, four hundred seventy-four".