72796421 has 2 divisors, whose sum is σ = 72796422. Its totient is φ = 72796420.

The previous prime is 72796417. The next prime is 72796439. The reversal of 72796421 is 12469727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57547396 + 15249025 = 7586^2 + 3905^2 .

It is an emirp because it is prime and its reverse (12469727) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72796421 - 2² = 72796417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72796441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36398210 + 36398211.

It is an arithmetic number, because the mean of its divisors is an integer number (36398211).

Almost surely, 2^72796421 is an apocalyptic number.

It is an amenable number.

72796421 is a deficient number, since it is larger than the sum of its proper divisors (1).

72796421 is an equidigital number, since it uses as much as digits as its factorization.

72796421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 38.

The square root of 72796421 is about 8532.0818678679. The cubic root of 72796421 is about 417.5450530462.

The spelling of 72796421 in words is "seventy-two million, seven hundred ninety-six thousand, four hundred twenty-one".