72963778421 has 8 divisors (see below), whose sum is σ = 74007194688. Its totient is φ = 71920800000.

The previous prime is 72963778403. The next prime is 72963778429. The reversal of 72963778421 is 12487736927.

It is a happy number.

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 72963778421 - 2¹⁴ = 72963762037 is a prime.

It is a super-2 number, since 2×72963778421² (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 (72963778429) 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, 233846 + ... + 447896.

It is an arithmetic number, because the mean of its divisors is an integer number (9250899336).

Almost surely, 2^72963778421 is an apocalyptic number.

72963778421 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

72963778421 is a deficient number, since it is larger than the sum of its proper divisors (1043416267).

72963778421 is a wasteful number, since it uses less digits than its factorization.

72963778421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218923.

The product of its digits is 7112448, while the sum is 56.

The spelling of 72963778421 in words is "seventy-two billion, nine hundred sixty-three million, seven hundred seventy-eight thousand, four hundred twenty-one".