72891473573 has 4 divisors (see below), whose sum is σ = 72892014048. Its totient is φ = 72890933100.

The previous prime is 72891473537. The next prime is 72891473591. The reversal of 72891473573 is 37537419827.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 72891473573 - 2¹² = 72891469477 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 (72891478573) 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, 117590 + ... + 399512.

It is an arithmetic number, because the mean of its divisors is an integer number (18223003512).

Almost surely, 2^72891473573 is an apocalyptic number.

It is an amenable number.

72891473573 is a deficient number, since it is larger than the sum of its proper divisors (540475).

72891473573 is a wasteful number, since it uses less digits than its factorization.

72891473573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540474.

The product of its digits is 8890560, while the sum is 56.

The spelling of 72891473573 in words is "seventy-two billion, eight hundred ninety-one million, four hundred seventy-three thousand, five hundred seventy-three".