73534928781 has 4 divisors (see below), whose sum is σ = 98046571712. Its totient is φ = 49023285852.

The previous prime is 73534928777. The next prime is 73534928783. The reversal of 73534928781 is 18782943537.

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 not a de Polignac number, because 73534928781 - 2² = 73534928777 is a prime.

It is a super-2 number, since 2×73534928781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73534928783) 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, 12255821461 + ... + 12255821466.

It is an arithmetic number, because the mean of its divisors is an integer number (24511642928).

Almost surely, 2^73534928781 is an apocalyptic number.

It is an amenable number.

73534928781 is a deficient number, since it is larger than the sum of its proper divisors (24511642931).

73534928781 is a wasteful number, since it uses less digits than its factorization.

73534928781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24511642930.

The product of its digits is 10160640, while the sum is 57.

The spelling of 73534928781 in words is "seventy-three billion, five hundred thirty-four million, nine hundred twenty-eight thousand, seven hundred eighty-one".