28780202064 has 20 divisors (see below), whose sum is σ = 74348855456. Its totient is φ = 9593400672.

The previous prime is 28780202053. The next prime is 28780202107. The reversal of 28780202064 is 46020208782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 299793724 + ... + 299793819.

Almost surely, 2^28780202064 is an apocalyptic number.

28780202064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28780202064 is an abundant number, since it is smaller than the sum of its proper divisors (45568653392).

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

28780202064 is a wasteful number, since it uses less digits than its factorization.

28780202064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599587554 (or 599587548 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 39.

The spelling of 28780202064 in words is "twenty-eight billion, seven hundred eighty million, two hundred two thousand, sixty-four".