28787678782 has 4 divisors (see below), whose sum is σ = 43181518176. Its totient is φ = 14393839390.

The previous prime is 28787678771. The next prime is 28787678819.

It is a happy number.

28787678782 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×28787678782² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7196919694 + ... + 7196919697.

It is an arithmetic number, because the mean of its divisors is an integer number (10795379544).

Almost surely, 2^28787678782 is an apocalyptic number.

28787678782 is a deficient number, since it is larger than the sum of its proper divisors (14393839394).

28787678782 is a wasteful number, since it uses less digits than its factorization.

28787678782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14393839393.

The product of its digits is 236027904, while the sum is 70.

The spelling of 28787678782 in words is "twenty-eight billion, seven hundred eighty-seven million, six hundred seventy-eight thousand, seven hundred eighty-two".