72401773 has 2 divisors, whose sum is σ = 72401774. Its totient is φ = 72401772.

The previous prime is 72401743. The next prime is 72401789. The reversal of 72401773 is 37710427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41964484 + 30437289 = 6478^2 + 5517^2 .

It is an emirp because it is prime and its reverse (37710427) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72401773 - 2⁹ = 72401261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72401713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36200886 + 36200887.

It is an arithmetic number, because the mean of its divisors is an integer number (36200887).

Almost surely, 2^72401773 is an apocalyptic number.

It is an amenable number.

72401773 is a deficient number, since it is larger than the sum of its proper divisors (1).

72401773 is an equidigital number, since it uses as much as digits as its factorization.

72401773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8232, while the sum is 31.

The square root of 72401773 is about 8508.9231398574. The cubic root of 72401773 is about 416.7891459314.

The spelling of 72401773 in words is "seventy-two million, four hundred one thousand, seven hundred seventy-three".