72687422 has 4 divisors (see below), whose sum is σ = 109031136. Its totient is φ = 36343710.

The previous prime is 72687403. The next prime is 72687431. The reversal of 72687422 is 22478627.

It is a happy number.

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

It is a super-2 number, since 2×72687422² = 10566922634012168, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18171854 + ... + 18171857.

It is an arithmetic number, because the mean of its divisors is an integer number (27257784).

Almost surely, 2^72687422 is an apocalyptic number.

72687422 is a deficient number, since it is larger than the sum of its proper divisors (36343714).

72687422 is a wasteful number, since it uses less digits than its factorization.

72687422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36343713.

The product of its digits is 75264, while the sum is 38.

The square root of 72687422 is about 8525.6918780824. The cubic root of 72687422 is about 417.3365504543.

The spelling of 72687422 in words is "seventy-two million, six hundred eighty-seven thousand, four hundred twenty-two".