32972747781 has 4 divisors (see below), whose sum is σ = 43963663712. Its totient is φ = 21981831852.

The previous prime is 32972747771. The next prime is 32972747809. The reversal of 32972747781 is 18774727923.

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 32972747781 - 2³¹ = 30825264133 is a prime.

It is a super-2 number, since 2×32972747781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32972747711) 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, 5495457961 + ... + 5495457966.

It is an arithmetic number, because the mean of its divisors is an integer number (10990915928).

Almost surely, 2^32972747781 is an apocalyptic number.

It is an amenable number.

32972747781 is a deficient number, since it is larger than the sum of its proper divisors (10990915931).

32972747781 is a wasteful number, since it uses less digits than its factorization.

32972747781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10990915930.

The product of its digits is 8297856, while the sum is 57.

The spelling of 32972747781 in words is "thirty-two billion, nine hundred seventy-two million, seven hundred forty-seven thousand, seven hundred eighty-one".