72643434 has 16 divisors (see below), whose sum is σ = 150297120. Its totient is φ = 23379440.

The previous prime is 72643433. The next prime is 72643451. The reversal of 72643434 is 43434627.

It is a junction number, because it is equal to n+sod(n) for n = 72643395 and 72643404.

It is not an unprimeable number, because it can be changed into a prime (72643433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208572 + ... + 208919.

It is an arithmetic number, because the mean of its divisors is an integer number (9393570).

Almost surely, 2^72643434 is an apocalyptic number.

72643434 is an abundant number, since it is smaller than the sum of its proper divisors (77653686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72643434 is a wasteful number, since it uses less digits than its factorization.

72643434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417525.

The product of its digits is 48384, while the sum is 33.

The square root of 72643434 is about 8523.1117556911. Note that the first 3 decimals coincide. The cubic root of 72643434 is about 417.2523474194.

The spelling of 72643434 in words is "seventy-two million, six hundred forty-three thousand, four hundred thirty-four".