28400923578 has 8 divisors (see below), whose sum is σ = 56801847168. Its totient is φ = 9466974524.

The previous prime is 28400923553. The next prime is 28400923583. The reversal of 28400923578 is 87532900482.

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

28400923578 is an admirable number.

It is a super-2 number, since 2×28400923578² (a number of 22 digits) contains 22 as substring.

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, 2366743626 + ... + 2366743637.

It is an arithmetic number, because the mean of its divisors is an integer number (7100230896).

Almost surely, 2^28400923578 is an apocalyptic number.

28400923578 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28400923578 is a wasteful number, since it uses less digits than its factorization.

28400923578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4733487268.

The product of its (nonzero) digits is 967680, while the sum is 48.

The spelling of 28400923578 in words is "twenty-eight billion, four hundred million, nine hundred twenty-three thousand, five hundred seventy-eight".