28231389140878 has 64 divisors (see below), whose sum is σ = 55576440576000. Its totient is φ = 10420087436640.

The previous prime is 28231389140849. The next prime is 28231389140879. The reversal of 28231389140878 is 87804198313282.

It is a super-2 number, since 2×28231389140878² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28231389140879) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 162443673 + ... + 162617371.

It is an arithmetic number, because the mean of its divisors is an integer number (868381884000).

Almost surely, 2^{28231389140878} is an apocalyptic number.

28231389140878 is a deficient number, since it is larger than the sum of its proper divisors (27345051435122).

28231389140878 is a wasteful number, since it uses less digits than its factorization.

28231389140878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229285.

The product of its (nonzero) digits is 37158912, while the sum is 64.

The spelling of 28231389140878 in words is "twenty-eight trillion, two hundred thirty-one billion, three hundred eighty-nine million, one hundred forty thousand, eight hundred seventy-eight".