40028687 has 4 divisors (see below), whose sum is σ = 42135480. Its totient is φ = 37921896.

The previous prime is 40028641. The next prime is 40028689. The reversal of 40028687 is 78682004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40028687 - 2¹² = 40024591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40028689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1053368 + ... + 1053405.

It is an arithmetic number, because the mean of its divisors is an integer number (10533870).

Almost surely, 2^40028687 is an apocalyptic number.

40028687 is a deficient number, since it is larger than the sum of its proper divisors (2106793).

40028687 is a wasteful number, since it uses less digits than its factorization.

40028687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2106792.

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 40028687 is about 6326.8228203420. The cubic root of 40028687 is about 342.0769265984.

The spelling of 40028687 in words is "forty million, twenty-eight thousand, six hundred eighty-seven".