28151805640 has 64 divisors (see below), whose sum is σ = 72754272000. Its totient is φ = 9603525888.

The previous prime is 28151805611. The next prime is 28151805641. The reversal of 28151805640 is 4650815182.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 28151805593 and 28151805602.

It is not an unprimeable number, because it can be changed into a prime (28151805641) 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, 196899 + ... + 308338.

It is an arithmetic number, because the mean of its divisors is an integer number (1136785500).

Almost surely, 2^28151805640 is an apocalyptic number.

28151805640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28151805640 is an abundant number, since it is smaller than the sum of its proper divisors (44602466360).

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

28151805640 is a wasteful number, since it uses less digits than its factorization.

28151805640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505454 (or 505450 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 40.

The spelling of 28151805640 in words is "twenty-eight billion, one hundred fifty-one million, eight hundred five thousand, six hundred forty".