28734157788 has 24 divisors (see below), whose sum is σ = 76624420992. Its totient is φ = 8209759344.

The previous prime is 28734157769. The next prime is 28734157789. The reversal of 28734157788 is 88775143782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28734157789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171036570 + ... + 171036737.

It is an arithmetic number, because the mean of its divisors is an integer number (3192684208).

Almost surely, 2^28734157788 is an apocalyptic number.

28734157788 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28734157788 is an abundant number, since it is smaller than the sum of its proper divisors (47890263204).

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

28734157788 is a wasteful number, since it uses less digits than its factorization.

28734157788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342073321 (or 342073319 counting only the distinct ones).

The product of its digits is 21073920, while the sum is 60.

The spelling of 28734157788 in words is "twenty-eight billion, seven hundred thirty-four million, one hundred fifty-seven thousand, seven hundred eighty-eight".