72969521029 has 4 divisors (see below), whose sum is σ = 74941670284. Its totient is φ = 70997371776.

The previous prime is 72969521003. The next prime is 72969521081. The reversal of 72969521029 is 92012596927.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92012596927 = 2683 ⋅34294669.

It can be written as a sum of positive squares in 2 ways, for example, as 27100732129 + 45868788900 = 164623^2 + 214170^2 .

It is a cyclic number.

It is not a de Polignac number, because 72969521029 - 2⁵ = 72969520997 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 (72969521099) 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, 986074572 + ... + 986074645.

It is an arithmetic number, because the mean of its divisors is an integer number (18735417571).

Almost surely, 2^72969521029 is an apocalyptic number.

It is an amenable number.

72969521029 is a deficient number, since it is larger than the sum of its proper divisors (1972149255).

72969521029 is a wasteful number, since it uses less digits than its factorization.

72969521029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1972149254.

The product of its (nonzero) digits is 1224720, while the sum is 52.

The spelling of 72969521029 in words is "seventy-two billion, nine hundred sixty-nine million, five hundred twenty-one thousand, twenty-nine".