28466857640 has 32 divisors (see below), whose sum is σ = 68977387080. Its totient is φ = 10510839552.

The previous prime is 28466857633. The next prime is 28466857703. The reversal of 28466857640 is 4675866482.

It can be written as a sum of positive squares in 4 ways, for example, as 20974570276 + 7492287364 = 144826^2 + 86558^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27371459 + ... + 27372498.

Almost surely, 2^28466857640 is an apocalyptic number.

28466857640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28466857640 is an abundant number, since it is smaller than the sum of its proper divisors (40510529440).

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

28466857640 is a wasteful number, since it uses less digits than its factorization.

28466857640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54743981 (or 54743977 counting only the distinct ones).

The product of its (nonzero) digits is 15482880, while the sum is 56.

The spelling of 28466857640 in words is "twenty-eight billion, four hundred sixty-six million, eight hundred fifty-seven thousand, six hundred forty".