72909019429 has 4 divisors (see below), whose sum is σ = 72922116940. Its totient is φ = 72895921920.

The previous prime is 72909019423. The next prime is 72909019453. The reversal of 72909019429 is 92491090927.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49099912225 + 23809107204 = 221585^2 + 154302^2 .

It is a cyclic number.

It is not a de Polignac number, because 72909019429 - 2⁷ = 72909019301 is a prime.

It is a super-2 number, since 2×72909019429² (a number of 23 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 (72909019423) 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, 6540402 + ... + 6551539.

It is an arithmetic number, because the mean of its divisors is an integer number (18230529235).

Almost surely, 2^72909019429 is an apocalyptic number.

It is an amenable number.

72909019429 is a deficient number, since it is larger than the sum of its proper divisors (13097511).

72909019429 is a wasteful number, since it uses less digits than its factorization.

72909019429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13097510.

The product of its (nonzero) digits is 734832, while the sum is 52.

The spelling of 72909019429 in words is "seventy-two billion, nine hundred nine million, nineteen thousand, four hundred twenty-nine".