72345434 has 16 divisors (see below), whose sum is σ = 127373568. Its totient is φ = 30166992.

The previous prime is 72345367. The next prime is 72345439. The reversal of 72345434 is 43454327.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 72345434.

It is not an unprimeable number, because it can be changed into a prime (72345439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69314 + ... + 70349.

It is an arithmetic number, because the mean of its divisors is an integer number (7960848).

Almost surely, 2^72345434 is an apocalyptic number.

72345434 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

72345434 is a deficient number, since it is larger than the sum of its proper divisors (55028134).

72345434 is a wasteful number, since it uses less digits than its factorization.

72345434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139709.

The product of its digits is 40320, while the sum is 32.

The square root of 72345434 is about 8505.6119121437. The cubic root of 72345434 is about 416.6810105640.

The spelling of 72345434 in words is "seventy-two million, three hundred forty-five thousand, four hundred thirty-four".