72963421 has 2 divisors, whose sum is σ = 72963422. Its totient is φ = 72963420.

The previous prime is 72963419. The next prime is 72963431. The reversal of 72963421 is 12436927.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68657796 + 4305625 = 8286^2 + 2075^2 .

It is a cyclic number.

It is not a de Polignac number, because 72963421 - 2¹ = 72963419 is a prime.

Together with 72963419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72963431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36481710 + 36481711.

It is an arithmetic number, because the mean of its divisors is an integer number (36481711).

Almost surely, 2^72963421 is an apocalyptic number.

It is an amenable number.

72963421 is a deficient number, since it is larger than the sum of its proper divisors (1).

72963421 is an equidigital number, since it uses as much as digits as its factorization.

72963421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 34.

The square root of 72963421 is about 8541.8628530315. The cubic root of 72963421 is about 417.8641015605.

The spelling of 72963421 in words is "seventy-two million, nine hundred sixty-three thousand, four hundred twenty-one".