73121623 has 4 divisors (see below), whose sum is σ = 76300848. Its totient is φ = 69942400.

The previous prime is 73121617. The next prime is 73121663. The reversal of 73121623 is 32612137.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73121623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73121603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1589578 + ... + 1589623.

It is an arithmetic number, because the mean of its divisors is an integer number (19075212).

Almost surely, 2^73121623 is an apocalyptic number.

73121623 is a deficient number, since it is larger than the sum of its proper divisors (3179225).

73121623 is a wasteful number, since it uses less digits than its factorization.

73121623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3179224.

The product of its digits is 1512, while the sum is 25.

The square root of 73121623 is about 8551.1182309684. The cubic root of 73121623 is about 418.1658930365.

The spelling of 73121623 in words is "seventy-three million, one hundred twenty-one thousand, six hundred twenty-three".