73638638 has 4 divisors (see below), whose sum is σ = 110457960. Its totient is φ = 36819318.

The previous prime is 73638629. The next prime is 73638641. The reversal of 73638638 is 83683637.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83683637 = 23 ⋅3638419.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18409658 + ... + 18409661.

It is an arithmetic number, because the mean of its divisors is an integer number (27614490).

Almost surely, 2^73638638 is an apocalyptic number.

73638638 is a deficient number, since it is larger than the sum of its proper divisors (36819322).

73638638 is a wasteful number, since it uses less digits than its factorization.

73638638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36819321.

The product of its digits is 435456, while the sum is 44.

The square root of 73638638 is about 8581.2958228930. The cubic root of 73638638 is about 419.1491429123.

The spelling of 73638638 in words is "seventy-three million, six hundred thirty-eight thousand, six hundred thirty-eight".