72900257021 has 8 divisors (see below), whose sum is σ = 77496035904. Its totient is φ = 68338648000.

The previous prime is 72900257011. The next prime is 72900257051. The reversal of 72900257021 is 12075200927.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72900257021 - 2¹⁰ = 72900255997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72900257011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8538065 + ... + 8546598.

It is an arithmetic number, because the mean of its divisors is an integer number (9687004488).

Almost surely, 2^72900257021 is an apocalyptic number.

It is an amenable number.

72900257021 is a deficient number, since it is larger than the sum of its proper divisors (4595778883).

72900257021 is a wasteful number, since it uses less digits than its factorization.

72900257021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17084931.

The product of its (nonzero) digits is 17640, while the sum is 35.

Adding to 72900257021 its reverse (12075200927), we get a palindrome (84975457948).

The spelling of 72900257021 in words is "seventy-two billion, nine hundred million, two hundred fifty-seven thousand, twenty-one".