72242737 has 4 divisors (see below), whose sum is σ = 82563136. Its totient is φ = 61922340.

The previous prime is 72242719. The next prime is 72242743. The reversal of 72242737 is 73724227.

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 a de Polignac number, because none of the positive numbers 2^k-72242737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72242767) 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, 5160189 + ... + 5160202.

It is an arithmetic number, because the mean of its divisors is an integer number (20640784).

Almost surely, 2^72242737 is an apocalyptic number.

It is an amenable number.

72242737 is a deficient number, since it is larger than the sum of its proper divisors (10320399).

72242737 is a wasteful number, since it uses less digits than its factorization.

72242737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10320398.

The product of its digits is 32928, while the sum is 34.

The square root of 72242737 is about 8499.5727539683. The cubic root of 72242737 is about 416.4837525313.

The spelling of 72242737 in words is "seventy-two million, two hundred forty-two thousand, seven hundred thirty-seven".