40228736 has 32 divisors (see below), whose sum is σ = 82018200. Its totient is φ = 19643904.

The previous prime is 40228729. The next prime is 40228753. The reversal of 40228736 is 63782204.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1850 + ... + 9158.

Almost surely, 2^40228736 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 40228736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41009100).

40228736 is an abundant number, since it is smaller than the sum of its proper divisors (41789464).

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

40228736 is an equidigital number, since it uses as much as digits as its factorization.

40228736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7366 (or 7354 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 40228736 is about 6342.6127108629. The cubic root of 40228736 is about 342.6458391119.

The spelling of 40228736 in words is "forty million, two hundred twenty-eight thousand, seven hundred thirty-six".