40128678 has 12 divisors (see below), whose sum is σ = 86945508. Its totient is φ = 13376220.

The previous prime is 40128659. The next prime is 40128679. The reversal of 40128678 is 87682104.

It is a super-2 number, since 2×40128678² = 3220621596055368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40128679) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1114668 + ... + 1114703.

It is an arithmetic number, because the mean of its divisors is an integer number (7245459).

Almost surely, 2^40128678 is an apocalyptic number.

40128678 is an abundant number, since it is smaller than the sum of its proper divisors (46816830).

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

40128678 is a wasteful number, since it uses less digits than its factorization.

40128678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2229379 (or 2229376 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 40128678 is about 6334.7200411699. The cubic root of 40128678 is about 342.3615239305.

The spelling of 40128678 in words is "forty million, one hundred twenty-eight thousand, six hundred seventy-eight".