28542077680 has 20 divisors (see below), whose sum is σ = 66360330792. Its totient is φ = 11416831040.

The previous prime is 28542077657. The next prime is 28542077687. The reversal of 28542077680 is 8677024582.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28542077687) 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, 178387906 + ... + 178388065.

Almost surely, 2^28542077680 is an apocalyptic number.

28542077680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28542077680 is an abundant number, since it is smaller than the sum of its proper divisors (37818253112).

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

28542077680 is a wasteful number, since it uses less digits than its factorization.

28542077680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356775984 (or 356775978 counting only the distinct ones).

The product of its (nonzero) digits is 1505280, while the sum is 49.

The spelling of 28542077680 in words is "twenty-eight billion, five hundred forty-two million, seventy-seven thousand, six hundred eighty".