72691006 has 4 divisors (see below), whose sum is σ = 109036512. Its totient is φ = 36345502.

The previous prime is 72690973. The next prime is 72691019. The reversal of 72691006 is 60019627.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 18172750 + ... + 18172753.

It is an arithmetic number, because the mean of its divisors is an integer number (27259128).

Almost surely, 2^72691006 is an apocalyptic number.

72691006 is a deficient number, since it is larger than the sum of its proper divisors (36345506).

72691006 is a wasteful number, since it uses less digits than its factorization.

72691006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36345505.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 72691006 is about 8525.9020637115. The cubic root of 72691006 is about 417.3434095485.

The spelling of 72691006 in words is "seventy-two million, six hundred ninety-one thousand, six".