73896821 has 4 divisors (see below), whose sum is σ = 74130252. Its totient is φ = 73663392.

The previous prime is 73896817. The next prime is 73896827. The reversal of 73896821 is 12869837.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16728100 + 57168721 = 4090^2 + 7561^2 .

It is a cyclic number.

It is not a de Polignac number, because 73896821 - 2² = 73896817 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 (73896827) 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, 116240 + ... + 116873.

It is an arithmetic number, because the mean of its divisors is an integer number (18532563).

Almost surely, 2^73896821 is an apocalyptic number.

It is an amenable number.

73896821 is a deficient number, since it is larger than the sum of its proper divisors (233431).

73896821 is a wasteful number, since it uses less digits than its factorization.

73896821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233430.

The product of its digits is 145152, while the sum is 44.

The square root of 73896821 is about 8596.3260175496. The cubic root of 73896821 is about 419.6384284248.

The spelling of 73896821 in words is "seventy-three million, eight hundred ninety-six thousand, eight hundred twenty-one".