40687878 has 32 divisors (see below), whose sum is σ = 101456640. Its totient is φ = 10568160.

The previous prime is 40687859. The next prime is 40687891. The reversal of 40687878 is 87878604.

It is a super-2 number, since 2×40687878² = 3311006832285768, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43573 + ... + 44496.

It is an arithmetic number, because the mean of its divisors is an integer number (3170520).

Almost surely, 2^40687878 is an apocalyptic number.

40687878 is an abundant number, since it is smaller than the sum of its proper divisors (60768762).

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

40687878 is a wasteful number, since it uses less digits than its factorization.

40687878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88092.

The product of its (nonzero) digits is 602112, while the sum is 48.

The square root of 40687878 is about 6378.7050409938. The cubic root of 40687878 is about 343.9444824323.

The spelling of 40687878 in words is "forty million, six hundred eighty-seven thousand, eight hundred seventy-eight".