72273949 has 4 divisors (see below), whose sum is σ = 78844320. Its totient is φ = 65703580.

The previous prime is 72273947. The next prime is 72273961. The reversal of 72273949 is 94937227.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72273949 - 2¹ = 72273947 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 (72273947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3285169 + ... + 3285190.

It is an arithmetic number, because the mean of its divisors is an integer number (19711080).

Almost surely, 2^72273949 is an apocalyptic number.

It is an amenable number.

72273949 is a deficient number, since it is larger than the sum of its proper divisors (6570371).

72273949 is a wasteful number, since it uses less digits than its factorization.

72273949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6570370.

The product of its digits is 190512, while the sum is 43.

The square root of 72273949 is about 8501.4086479830. The cubic root of 72273949 is about 416.5437235853.

Subtracting 72273949 from its reverse (94937227), we obtain a triangular number (22663278 = T₆₇₃₂).

The spelling of 72273949 in words is "seventy-two million, two hundred seventy-three thousand, nine hundred forty-nine".