72651806 has 4 divisors (see below), whose sum is σ = 108977712. Its totient is φ = 36325902.

The previous prime is 72651791. The next prime is 72651841. The reversal of 72651806 is 60815627.

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 (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18162950 + ... + 18162953.

It is an arithmetic number, because the mean of its divisors is an integer number (27244428).

Almost surely, 2^72651806 is an apocalyptic number.

72651806 is a deficient number, since it is larger than the sum of its proper divisors (36325906).

72651806 is a wasteful number, since it uses less digits than its factorization.

72651806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36325905.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 72651806 is about 8523.6028767183. The cubic root of 72651806 is about 417.2683759498.

The spelling of 72651806 in words is "seventy-two million, six hundred fifty-one thousand, eight hundred six".