72106739 has 4 divisors (see below), whose sum is σ = 72142560. Its totient is φ = 72070920.

The previous prime is 72106733. The next prime is 72106751. The reversal of 72106739 is 93760127.

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 72106739 - 2²⁴ = 55329523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72106699 and 72106708.

It is not an unprimeable number, because it can be changed into a prime (72106733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14699 + ... + 18980.

It is an arithmetic number, because the mean of its divisors is an integer number (18035640).

Almost surely, 2^72106739 is an apocalyptic number.

72106739 is a deficient number, since it is larger than the sum of its proper divisors (35821).

72106739 is a wasteful number, since it uses less digits than its factorization.

72106739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35820.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 72106739 is about 8491.5687007761. The cubic root of 72106739 is about 416.2222427961. Note that the first 4 decimals are identical.

The spelling of 72106739 in words is "seventy-two million, one hundred six thousand, seven hundred thirty-nine".