72621921769 has 4 divisors (see below), whose sum is σ = 73056783744. Its totient is φ = 72187059796.

The previous prime is 72621921751. The next prime is 72621921793. The reversal of 72621921769 is 96712912627.

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 a cyclic number.

It is not a de Polignac number, because 72621921769 - 2¹⁹ = 72621397481 is a prime.

It is a super-2 number, since 2×72621921769² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72621921739) 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, 217430737 + ... + 217431070.

It is an arithmetic number, because the mean of its divisors is an integer number (18264195936).

Almost surely, 2^72621921769 is an apocalyptic number.

It is an amenable number.

72621921769 is a deficient number, since it is larger than the sum of its proper divisors (434861975).

72621921769 is a wasteful number, since it uses less digits than its factorization.

72621921769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434861974.

The product of its digits is 1143072, while the sum is 52.

The spelling of 72621921769 in words is "seventy-two billion, six hundred twenty-one million, nine hundred twenty-one thousand, seven hundred sixty-nine".