74139478 has 16 divisors (see below), whose sum is σ = 128888064. Its totient is φ = 31326120.

The previous prime is 74139469. The next prime is 74139479. The reversal of 74139478 is 87493147.

It is a super-2 number, since 2×74139478² = 10993324396224968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74139479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36300 + ... + 38287.

It is an arithmetic number, because the mean of its divisors is an integer number (8055504).

Almost surely, 2^74139478 is an apocalyptic number.

74139478 is a deficient number, since it is larger than the sum of its proper divisors (54748586).

74139478 is a wasteful number, since it uses less digits than its factorization.

74139478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74667.

The product of its digits is 169344, while the sum is 43.

The square root of 74139478 is about 8610.4284446246. The cubic root of 74139478 is about 420.0972526113.

The spelling of 74139478 in words is "seventy-four million, one hundred thirty-nine thousand, four hundred seventy-eight".