28214493978 has 32 divisors (see below), whose sum is σ = 62156570112. Its totient is φ = 8466836400.

The previous prime is 28214493961. The next prime is 28214493997. The reversal of 28214493978 is 87939441282.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2068408 + ... + 2082003.

It is an arithmetic number, because the mean of its divisors is an integer number (1942392816).

Almost surely, 2^28214493978 is an apocalyptic number.

28214493978 is an abundant number, since it is smaller than the sum of its proper divisors (33942076134).

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

28214493978 is a wasteful number, since it uses less digits than its factorization.

28214493978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4150530.

The product of its digits is 6967296, while the sum is 57.

The spelling of 28214493978 in words is "twenty-eight billion, two hundred fourteen million, four hundred ninety-three thousand, nine hundred seventy-eight".