72343451 has 4 divisors (see below), whose sum is σ = 73423272. Its totient is φ = 71263632.

The previous prime is 72343433. The next prime is 72343457. The reversal of 72343451 is 15434327.

It is a happy number.

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 72343451 - 2¹⁰ = 72342427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72343457) 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, 539810 + ... + 539943.

It is an arithmetic number, because the mean of its divisors is an integer number (18355818).

Almost surely, 2^72343451 is an apocalyptic number.

72343451 is a deficient number, since it is larger than the sum of its proper divisors (1079821).

72343451 is a wasteful number, since it uses less digits than its factorization.

72343451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079820.

The product of its digits is 10080, while the sum is 29.

The square root of 72343451 is about 8505.4953412485. The cubic root of 72343451 is about 416.6772034313.

Adding to 72343451 its reverse (15434327), we get a palindrome (87777778).

The spelling of 72343451 in words is "seventy-two million, three hundred forty-three thousand, four hundred fifty-one".