72216026 has 4 divisors (see below), whose sum is σ = 108324042. Its totient is φ = 36108012.

The previous prime is 72216013. The next prime is 72216029. The reversal of 72216026 is 62061227.

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

It can be written as a sum of positive squares in only one way, i.e., 67158025 + 5058001 = 8195^2 + 2249^2 .

It is a super-2 number, since 2×72216026² = 10430308822465352, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72215986 and 72216004.

It is not an unprimeable number, because it can be changed into a prime (72216029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18054005 + ... + 18054008.

Almost surely, 2^72216026 is an apocalyptic number.

72216026 is a deficient number, since it is larger than the sum of its proper divisors (36108016).

72216026 is a wasteful number, since it uses less digits than its factorization.

72216026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36108015.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 72216026 is about 8498.0012944221. The cubic root of 72216026 is about 416.4324160264.

The spelling of 72216026 in words is "seventy-two million, two hundred sixteen thousand, twenty-six".