28780575778 has 8 divisors (see below), whose sum is σ = 43481445840. Its totient is φ = 14286760500.

The previous prime is 28780575773. The next prime is 28780575787. The reversal of 28780575778 is 87757508782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×28780575778² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28780575773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51763348 + ... + 51763903.

It is an arithmetic number, because the mean of its divisors is an integer number (5435180730).

Almost surely, 2^28780575778 is an apocalyptic number.

28780575778 is a deficient number, since it is larger than the sum of its proper divisors (14700870062).

28780575778 is a wasteful number, since it uses less digits than its factorization.

28780575778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103527392.

The product of its (nonzero) digits is 61465600, while the sum is 64.

The spelling of 28780575778 in words is "twenty-eight billion, seven hundred eighty million, five hundred seventy-five thousand, seven hundred seventy-eight".