73638434 has 4 divisors (see below), whose sum is σ = 110457654. Its totient is φ = 36819216.

The previous prime is 73638379. The next prime is 73638443. The reversal of 73638434 is 43483637.

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: 43483637 = 17 ⋅2557861.

It can be written as a sum of positive squares in only one way, i.e., 67650625 + 5987809 = 8225^2 + 2447^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18409607 + ... + 18409610.

Almost surely, 2^73638434 is an apocalyptic number.

73638434 is a deficient number, since it is larger than the sum of its proper divisors (36819220).

73638434 is a wasteful number, since it uses less digits than its factorization.

73638434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36819219.

The product of its digits is 145152, while the sum is 38.

The square root of 73638434 is about 8581.2839365680. The cubic root of 73638434 is about 419.1487558578.

The spelling of 73638434 in words is "seventy-three million, six hundred thirty-eight thousand, four hundred thirty-four".