72215737 has 8 divisors (see below), whose sum is σ = 79130592. Its totient is φ = 65359200.

The previous prime is 72215729. The next prime is 72215753. The reversal of 72215737 is 73751227.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72215737 - 2³ = 72215729 is a prime.

It is a super-2 number, since 2×72215737² = 10430225340906338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72215777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11964 + ... + 16957.

It is an arithmetic number, because the mean of its divisors is an integer number (9891324).

Almost surely, 2^72215737 is an apocalyptic number.

It is an amenable number.

72215737 is a deficient number, since it is larger than the sum of its proper divisors (6914855).

72215737 is a wasteful number, since it uses less digits than its factorization.

72215737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29159.

The product of its digits is 20580, while the sum is 34.

The square root of 72215737 is about 8497.9842904068. The cubic root of 72215737 is about 416.4318605212.

The spelling of 72215737 in words is "seventy-two million, two hundred fifteen thousand, seven hundred thirty-seven".