72369221 has 16 divisors (see below), whose sum is σ = 80621568. Its totient is φ = 64646400.

The previous prime is 72369197. The next prime is 72369251. The reversal of 72369221 is 12296327.

72369221 = T₂₃₈ + T₂₃₉ + ... + T₇₆₄.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 72369221 - 2¹⁴ = 72352837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72369251) 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, 26636 + ... + 29226.

It is an arithmetic number, because the mean of its divisors is an integer number (5038848).

Almost surely, 2^72369221 is an apocalyptic number.

It is an amenable number.

72369221 is a deficient number, since it is larger than the sum of its proper divisors (8252347).

72369221 is a wasteful number, since it uses less digits than its factorization.

72369221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2692.

The product of its digits is 9072, while the sum is 32.

The square root of 72369221 is about 8507.0101093157. The cubic root of 72369221 is about 416.7266734554.

The spelling of 72369221 in words is "seventy-two million, three hundred sixty-nine thousand, two hundred twenty-one".