72681398 has 4 divisors (see below), whose sum is σ = 109022100. Its totient is φ = 36340698.

The previous prime is 72681373. The next prime is 72681419. The reversal of 72681398 is 89318627.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18170348 + ... + 18170351.

It is an arithmetic number, because the mean of its divisors is an integer number (27255525).

Almost surely, 2^72681398 is an apocalyptic number.

72681398 is a deficient number, since it is larger than the sum of its proper divisors (36340702).

72681398 is a wasteful number, since it uses less digits than its factorization.

72681398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36340701.

The product of its digits is 145152, while the sum is 44.

The square root of 72681398 is about 8525.3385856516. The cubic root of 72681398 is about 417.3250211564.

The spelling of 72681398 in words is "seventy-two million, six hundred eighty-one thousand, three hundred ninety-eight".