28693887640 has 64 divisors (see below), whose sum is σ = 70483232160. Its totient is φ = 10426321920.

The previous prime is 28693887637. The next prime is 28693887643. The reversal of 28693887640 is 4678839682.

It is an interprime number because it is at equal distance from previous prime (28693887637) and next prime (28693887643).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28693887643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 580372 + ... + 627868.

Almost surely, 2^28693887640 is an apocalyptic number.

28693887640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28693887640 is an abundant number, since it is smaller than the sum of its proper divisors (41789344520).

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

28693887640 is a wasteful number, since it uses less digits than its factorization.

28693887640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48892 (or 48888 counting only the distinct ones).

The product of its (nonzero) digits is 27869184, while the sum is 61.

The spelling of 28693887640 in words is "twenty-eight billion, six hundred ninety-three million, eight hundred eighty-seven thousand, six hundred forty".