28420666600 has 48 divisors (see below), whose sum is σ = 66983263020. Its totient is φ = 11212531200.

The previous prime is 28420666591. The next prime is 28420666601. The reversal of 28420666600 is 666602482.

It can be written as a sum of positive squares in 6 ways, for example, as 7004685636 + 21415980964 = 83694^2 + 146342^2 .

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

It is not an unprimeable number, because it can be changed into a prime (28420666601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 958711 + ... + 987910.

Almost surely, 2^28420666600 is an apocalyptic number.

28420666600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28420666600 is an abundant number, since it is smaller than the sum of its proper divisors (38562596420).

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

28420666600 is a wasteful number, since it uses less digits than its factorization.

28420666600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1946710 (or 1946701 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 40.

The spelling of 28420666600 in words is "twenty-eight billion, four hundred twenty million, six hundred sixty-six thousand, six hundred".