28287151640 has 64 divisors (see below), whose sum is σ = 70148000160. Its totient is φ = 10180177920.

The previous prime is 28287151603. The next prime is 28287151661. The reversal of 28287151640 is 4615178282.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 28287151591 and 28287151600.

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, 288707 + ... + 374066.

Almost surely, 2^28287151640 is an apocalyptic number.

28287151640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28287151640 is an abundant number, since it is smaller than the sum of its proper divisors (41860848520).

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

28287151640 is a wasteful number, since it uses less digits than its factorization.

28287151640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662892 (or 662888 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 44.

The spelling of 28287151640 in words is "twenty-eight billion, two hundred eighty-seven million, one hundred fifty-one thousand, six hundred forty".