72688426 has 4 divisors (see below), whose sum is σ = 109032642. Its totient is φ = 36344212.

The previous prime is 72688409. The next prime is 72688457. The reversal of 72688426 is 62488627.

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., 57078025 + 15610401 = 7555^2 + 3951^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18172105 + ... + 18172108.

Almost surely, 2^72688426 is an apocalyptic number.

72688426 is a deficient number, since it is larger than the sum of its proper divisors (36344216).

72688426 is a wasteful number, since it uses less digits than its factorization.

72688426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36344215.

The product of its digits is 258048, while the sum is 43.

The square root of 72688426 is about 8525.7507587309. The cubic root of 72688426 is about 417.3384719420.

The spelling of 72688426 in words is "seventy-two million, six hundred eighty-eight thousand, four hundred twenty-six".