72293866 has 4 divisors (see below), whose sum is σ = 108440802. Its totient is φ = 36146932.

The previous prime is 72293831. The next prime is 72293867. The reversal of 72293866 is 66839227.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 70913241 + 1380625 = 8421^2 + 1175^2 .

It is a super-2 number, since 2×72293866² = 10452806122451912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72293867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18073465 + ... + 18073468.

Almost surely, 2^72293866 is an apocalyptic number.

72293866 is a deficient number, since it is larger than the sum of its proper divisors (36146936).

72293866 is a wasteful number, since it uses less digits than its factorization.

72293866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36146935.

The product of its digits is 217728, while the sum is 43.

The square root of 72293866 is about 8502.5799614000. The cubic root of 72293866 is about 416.5819832879.

The spelling of 72293866 in words is "seventy-two million, two hundred ninety-three thousand, eight hundred sixty-six".