73887406721 has 4 divisors (see below), whose sum is σ = 73975473600. Its totient is φ = 73799339844.

The previous prime is 73887406667. The next prime is 73887406741. The reversal of 73887406721 is 12760478837.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 73887406721 - 2⁶ = 73887406657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73887406741) 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, 44032181 + ... + 44033858.

It is an arithmetic number, because the mean of its divisors is an integer number (18493868400).

Almost surely, 2^73887406721 is an apocalyptic number.

It is an amenable number.

73887406721 is a deficient number, since it is larger than the sum of its proper divisors (88066879).

73887406721 is an equidigital number, since it uses as much as digits as its factorization.

73887406721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88066878.

The product of its (nonzero) digits is 3161088, while the sum is 53.

The spelling of 73887406721 in words is "seventy-three billion, eight hundred eighty-seven million, four hundred six thousand, seven hundred twenty-one".