28777999478 has 8 divisors (see below), whose sum is σ = 43452873840. Its totient is φ = 14293708200.

The previous prime is 28777999451. The next prime is 28777999489. The reversal of 28777999478 is 87499977782.

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

It is a junction number, because it is equal to n+sod(n) for n = 28777999399 and 28777999408.

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, 47645393 + ... + 47645996.

It is an arithmetic number, because the mean of its divisors is an integer number (5431609230).

Almost surely, 2^28777999478 is an apocalyptic number.

28777999478 is a deficient number, since it is larger than the sum of its proper divisors (14674874362).

28777999478 is a wasteful number, since it uses less digits than its factorization.

28777999478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95291542.

The product of its digits is 896168448, while the sum is 77.

The spelling of 28777999478 in words is "twenty-eight billion, seven hundred seventy-seven million, nine hundred ninety-nine thousand, four hundred seventy-eight".