72689951 has 4 divisors (see below), whose sum is σ = 72846072. Its totient is φ = 72533832.

The previous prime is 72689927. The next prime is 72689993. The reversal of 72689951 is 15998627.

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

It is a cyclic number.

It is not a de Polignac number, because 72689951 - 2⁶ = 72689887 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72689896 and 72689905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72689251) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 77360 + ... + 78293.

It is an arithmetic number, because the mean of its divisors is an integer number (18211518).

Almost surely, 2^72689951 is an apocalyptic number.

72689951 is a deficient number, since it is larger than the sum of its proper divisors (156121).

72689951 is a wasteful number, since it uses less digits than its factorization.

72689951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156120.

The product of its digits is 272160, while the sum is 47.

The square root of 72689951 is about 8525.8401932009. The cubic root of 72689951 is about 417.3413905026.

The spelling of 72689951 in words is "seventy-two million, six hundred eighty-nine thousand, nine hundred fifty-one".