72221667 has 16 divisors (see below), whose sum is σ = 110672640. Its totient is φ = 41036832.

The previous prime is 72221647. The next prime is 72221671. The reversal of 72221667 is 76612227.

It is not a de Polignac number, because 72221667 - 2¹² = 72217571 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72221647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5848 + ... + 13365.

It is an arithmetic number, because the mean of its divisors is an integer number (6917040).

Almost surely, 2^72221667 is an apocalyptic number.

72221667 is a deficient number, since it is larger than the sum of its proper divisors (38450973).

72221667 is a wasteful number, since it uses less digits than its factorization.

72221667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19402.

The product of its digits is 14112, while the sum is 33.

The square root of 72221667 is about 8498.3331895143. Note that the first 3 decimals coincide. The cubic root of 72221667 is about 416.4432586524.

The spelling of 72221667 in words is "seventy-two million, two hundred twenty-one thousand, six hundred sixty-seven".