73521638 has 4 divisors (see below), whose sum is σ = 110282460. Its totient is φ = 36760818.

The previous prime is 73521619. The next prime is 73521689. The reversal of 73521638 is 83612537.

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

It is a junction number, because it is equal to n+sod(n) for n = 73521598 and 73521607.

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, 18380408 + ... + 18380411.

It is an arithmetic number, because the mean of its divisors is an integer number (27570615).

Almost surely, 2^73521638 is an apocalyptic number.

73521638 is a deficient number, since it is larger than the sum of its proper divisors (36760822).

73521638 is a wasteful number, since it uses less digits than its factorization.

73521638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36760821.

The product of its digits is 30240, while the sum is 35.

The square root of 73521638 is about 8574.4759606637. The cubic root of 73521638 is about 418.9270382922.

The spelling of 73521638 in words is "seventy-three million, five hundred twenty-one thousand, six hundred thirty-eight".