72861385 has 4 divisors (see below), whose sum is σ = 87433668. Its totient is φ = 58289104.

The previous prime is 72861359. The next prime is 72861403. The reversal of 72861385 is 58316827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58316827 = 1999 ⋅29173.

It can be written as a sum of positive squares in 2 ways, for example, as 52186176 + 20675209 = 7224^2 + 4547^2 .

It is a cyclic number.

It is not a de Polignac number, because 72861385 - 2⁵ = 72861353 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7286134 + ... + 7286143.

It is an arithmetic number, because the mean of its divisors is an integer number (21858417).

Almost surely, 2^72861385 is an apocalyptic number.

It is an amenable number.

72861385 is a deficient number, since it is larger than the sum of its proper divisors (14572283).

72861385 is a wasteful number, since it uses less digits than its factorization.

72861385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14572282.

The product of its digits is 80640, while the sum is 40.

The square root of 72861385 is about 8535.8880615903. Note that the first 3 decimals coincide. The cubic root of 72861385 is about 417.6692227581.

The spelling of 72861385 in words is "seventy-two million, eight hundred sixty-one thousand, three hundred eighty-five".