72351647 has 4 divisors (see below), whose sum is σ = 72726720. Its totient is φ = 71976576.

The previous prime is 72351619. The next prime is 72351649. The reversal of 72351647 is 74615327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74615327 = 887 ⋅84121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72351647 is a prime.

It is a super-2 number, since 2×72351647² = 10469521647225218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72351649) 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, 187247 + ... + 187632.

It is an arithmetic number, because the mean of its divisors is an integer number (18181680).

Almost surely, 2^72351647 is an apocalyptic number.

72351647 is a deficient number, since it is larger than the sum of its proper divisors (375073).

72351647 is a wasteful number, since it uses less digits than its factorization.

72351647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375072.

The product of its digits is 35280, while the sum is 35.

The square root of 72351647 is about 8505.9771337572. The cubic root of 72351647 is about 416.6929383613.

The spelling of 72351647 in words is "seventy-two million, three hundred fifty-one thousand, six hundred forty-seven".