40128508 has 48 divisors (see below), whose sum is σ = 83994624. Its totient is φ = 16413120.

The previous prime is 40128499. The next prime is 40128509. The reversal of 40128508 is 80582104.

It is a super-2 number, since 2×40128508² = 3220594308612128, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40128509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71766 + ... + 72322.

It is an arithmetic number, because the mean of its divisors is an integer number (1749888).

Almost surely, 2^40128508 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 40128508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41997312).

40128508 is an abundant number, since it is smaller than the sum of its proper divisors (43866116).

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

40128508 is a wasteful number, since it uses less digits than its factorization.

40128508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682 (or 680 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 40128508 is about 6334.7066230410. The cubic root of 40128508 is about 342.3610404729.

The spelling of 40128508 in words is "forty million, one hundred twenty-eight thousand, five hundred eight".