28065533784 has 64 divisors (see below), whose sum is σ = 74320403040. Its totient is φ = 8801402880.

The previous prime is 28065533761. The next prime is 28065533789. The reversal of 28065533784 is 48733556082.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28065533789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1143724 + ... + 1168004.

Almost surely, 2^28065533784 is an apocalyptic number.

28065533784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28065533784 is an abundant number, since it is smaller than the sum of its proper divisors (46254869256).

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

28065533784 is a wasteful number, since it uses less digits than its factorization.

28065533784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27140 (or 27136 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 51.

The spelling of 28065533784 in words is "twenty-eight billion, sixty-five million, five hundred thirty-three thousand, seven hundred eighty-four".