72706351 has 4 divisors (see below), whose sum is σ = 72912672. Its totient is φ = 72500032.

The previous prime is 72706339. The next prime is 72706363. The reversal of 72706351 is 15360727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15360727 = 83 ⋅185069.

It is an interprime number because it is at equal distance from previous prime (72706339) and next prime (72706363).

It is a cyclic number.

It is not a de Polignac number, because 72706351 - 2¹³ = 72698159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72706391) 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, 102631 + ... + 103336.

It is an arithmetic number, because the mean of its divisors is an integer number (18228168).

Almost surely, 2^72706351 is an apocalyptic number.

72706351 is a deficient number, since it is larger than the sum of its proper divisors (206321).

72706351 is a wasteful number, since it uses less digits than its factorization.

72706351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206320.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 72706351 is about 8526.8019210018. The cubic root of 72706351 is about 417.3727744103.

The spelling of 72706351 in words is "seventy-two million, seven hundred six thousand, three hundred fifty-one".