72704273 has 2 divisors, whose sum is σ = 72704274. Its totient is φ = 72704272.

The previous prime is 72704263. The next prime is 72704293. The reversal of 72704273 is 37240727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48330304 + 24373969 = 6952^2 + 4937^2 .

It is a cyclic number.

It is not a de Polignac number, because 72704273 - 2⁶ = 72704209 is a prime.

It is a super-2 number, since 2×72704273² = 10571822624917058, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (72704243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36352136 + 36352137.

It is an arithmetic number, because the mean of its divisors is an integer number (36352137).

Almost surely, 2^72704273 is an apocalyptic number.

It is an amenable number.

72704273 is a deficient number, since it is larger than the sum of its proper divisors (1).

72704273 is an equidigital number, since it uses as much as digits as its factorization.

72704273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16464, while the sum is 32.

The square root of 72704273 is about 8526.6800690538. The cubic root of 72704273 is about 417.3687981007.

The spelling of 72704273 in words is "seventy-two million, seven hundred four thousand, two hundred seventy-three".