72742247 has 4 divisors (see below), whose sum is σ = 73230600. Its totient is φ = 72253896.

The previous prime is 72742217. The next prime is 72742249. The reversal of 72742247 is 74224727.

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

It is a cyclic number.

It is not a de Polignac number, because 72742247 - 2⁶ = 72742183 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 (72742249) 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, 243953 + ... + 244250.

It is an arithmetic number, because the mean of its divisors is an integer number (18307650).

Almost surely, 2^72742247 is an apocalyptic number.

72742247 is a deficient number, since it is larger than the sum of its proper divisors (488353).

72742247 is a wasteful number, since it uses less digits than its factorization.

72742247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488352.

The product of its digits is 43904, while the sum is 35.

The square root of 72742247 is about 8528.9065535976. The cubic root of 72742247 is about 417.4414504291.

The spelling of 72742247 in words is "seventy-two million, seven hundred forty-two thousand, two hundred forty-seven".