72349643 has 4 divisors (see below), whose sum is σ = 73340808. Its totient is φ = 71358480.

The previous prime is 72349631. The next prime is 72349657. The reversal of 72349643 is 34694327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34694327 = 23 ⋅1508449.

It is a cyclic number.

It is not a de Polignac number, because 72349643 - 2¹⁴ = 72333259 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72349597 and 72349606.

It is not an unprimeable number, because it can be changed into a prime (72343643) 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, 495473 + ... + 495618.

It is an arithmetic number, because the mean of its divisors is an integer number (18335202).

Almost surely, 2^72349643 is an apocalyptic number.

72349643 is a gapful number since it is divisible by the number (73) formed by its first and last digit.

72349643 is a deficient number, since it is larger than the sum of its proper divisors (991165).

72349643 is an equidigital number, since it uses as much as digits as its factorization.

72349643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991164.

The product of its digits is 108864, while the sum is 38.

The square root of 72349643 is about 8505.8593334242. The cubic root of 72349643 is about 416.6890911309.

The spelling of 72349643 in words is "seventy-two million, three hundred forty-nine thousand, six hundred forty-three".