72801266 has 4 divisors (see below), whose sum is σ = 109201902. Its totient is φ = 36400632.

The previous prime is 72801257. The next prime is 72801301. The reversal of 72801266 is 66210827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66210827 = 47 ⋅1408741.

It can be written as a sum of positive squares in only one way, i.e., 50908225 + 21893041 = 7135^2 + 4679^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18200315 + ... + 18200318.

Almost surely, 2^72801266 is an apocalyptic number.

72801266 is a deficient number, since it is larger than the sum of its proper divisors (36400636).

72801266 is a wasteful number, since it uses less digits than its factorization.

72801266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36400635.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 72801266 is about 8532.3657915024. The cubic root of 72801266 is about 417.5543161431.

The spelling of 72801266 in words is "seventy-two million, eight hundred one thousand, two hundred sixty-six".