72346507621 has 4 divisors (see below), whose sum is σ = 72347687244. Its totient is φ = 72345328000.

The previous prime is 72346507609. The next prime is 72346507637. The reversal of 72346507621 is 12670564327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12670564327 = 137 ⋅92485871.

It can be written as a sum of positive squares in 2 ways, for example, as 27635405121 + 44711102500 = 166239^2 + 211450^2 .

It is a cyclic number.

It is not a de Polignac number, because 72346507621 - 2¹¹ = 72346505573 is a prime.

It is a super-3 number, since 3×72346507621³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72346507661) 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, 492460 + ... + 622261.

It is an arithmetic number, because the mean of its divisors is an integer number (18086921811).

Almost surely, 2^72346507621 is an apocalyptic number.

It is an amenable number.

72346507621 is a deficient number, since it is larger than the sum of its proper divisors (1179623).

72346507621 is a wasteful number, since it uses less digits than its factorization.

72346507621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179622.

The product of its (nonzero) digits is 423360, while the sum is 43.

The spelling of 72346507621 in words is "seventy-two billion, three hundred forty-six million, five hundred seven thousand, six hundred twenty-one".