28793335978 has 32 divisors (see below), whose sum is σ = 47486799360. Its totient is φ = 12985110000.

The previous prime is 28793335973. The next prime is 28793335993. The reversal of 28793335978 is 87953339782.

It is not an unprimeable number, because it can be changed into a prime (28793335973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7799113 + ... + 7802803.

It is an arithmetic number, because the mean of its divisors is an integer number (1483962480).

Almost surely, 2^28793335978 is an apocalyptic number.

28793335978 is a deficient number, since it is larger than the sum of its proper divisors (18693463382).

28793335978 is a wasteful number, since it uses less digits than its factorization.

28793335978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6394.

The product of its digits is 68584320, while the sum is 64.

The spelling of 28793335978 in words is "twenty-eight billion, seven hundred ninety-three million, three hundred thirty-five thousand, nine hundred seventy-eight".