72212737 has 2 divisors, whose sum is σ = 72212738. Its totient is φ = 72212736.

The previous prime is 72212729. The next prime is 72212741. The reversal of 72212737 is 73721227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65431921 + 6780816 = 8089^2 + 2604^2 .

It is a cyclic number.

It is not a de Polignac number, because 72212737 - 2³ = 72212729 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72212699 and 72212708.

It is not a weakly prime, because it can be changed into another prime (72212747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36106368 + 36106369.

It is an arithmetic number, because the mean of its divisors is an integer number (36106369).

Almost surely, 2^72212737 is an apocalyptic number.

It is an amenable number.

72212737 is a deficient number, since it is larger than the sum of its proper divisors (1).

72212737 is an equidigital number, since it uses as much as digits as its factorization.

72212737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8232, while the sum is 31.

The square root of 72212737 is about 8497.8077761267. The cubic root of 72212737 is about 416.4260939439.

The spelling of 72212737 in words is "seventy-two million, two hundred twelve thousand, seven hundred thirty-seven".