72278026 has 4 divisors (see below), whose sum is σ = 108417042. Its totient is φ = 36139012.

The previous prime is 72278021. The next prime is 72278027. The reversal of 72278026 is 62087227.

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., 72267001 + 11025 = 8501^2 + 105^2 .

It is a super-2 number, since 2×72278026² = 10448226084913352, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72277982 and 72278000.

It is not an unprimeable number, because it can be changed into a prime (72278021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18069505 + ... + 18069508.

Almost surely, 2^72278026 is an apocalyptic number.

72278026 is a deficient number, since it is larger than the sum of its proper divisors (36139016).

72278026 is a wasteful number, since it uses less digits than its factorization.

72278026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36139015.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 72278026 is about 8501.6484283932. The cubic root of 72278026 is about 416.5515558995.

The spelling of 72278026 in words is "seventy-two million, two hundred seventy-eight thousand, twenty-six".