28705845132987 has 32 divisors (see below), whose sum is σ = 41925916852224. Its totient is φ = 17325886586400.

The previous prime is 28705845132983. The next prime is 28705845133019. The reversal of 28705845132987 is 78923154850782.

It is not a de Polignac number, because 28705845132987 - 2² = 28705845132983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28705845132983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20305398 + ... + 21673044.

It is an arithmetic number, because the mean of its divisors is an integer number (1310184901632).

Almost surely, 2^{28705845132987} is an apocalyptic number.

28705845132987 is a deficient number, since it is larger than the sum of its proper divisors (13220071719237).

28705845132987 is a wasteful number, since it uses less digits than its factorization.

28705845132987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1370279.

The product of its (nonzero) digits is 270950400, while the sum is 69.

The spelling of 28705845132987 in words is "twenty-eight trillion, seven hundred five billion, eight hundred forty-five million, one hundred thirty-two thousand, nine hundred eighty-seven".