72234428 has 96 divisors (see below), whose sum is σ = 165312000. Its totient is φ = 27433728.

The previous prime is 72234419. The next prime is 72234443. The reversal of 72234428 is 82443227.

Its product of digits (21504) is a multiple of the sum of its prime factors (224).

It is a junction number, because it is equal to n+sod(n) for n = 72234394 and 72234403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 443075 + ... + 443237.

It is an arithmetic number, because the mean of its divisors is an integer number (1722000).

Almost surely, 2^72234428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72234428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82656000).

72234428 is an abundant number, since it is smaller than the sum of its proper divisors (93077572).

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

72234428 is a wasteful number, since it uses less digits than its factorization.

72234428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224 (or 208 counting only the distinct ones).

The product of its digits is 21504, while the sum is 32.

The square root of 72234428 is about 8499.0839506384. The cubic root of 72234428 is about 416.4677846231.

The spelling of 72234428 in words is "seventy-two million, two hundred thirty-four thousand, four hundred twenty-eight".