920281978 has 64 divisors (see below), whose sum is σ = 1848324096. Its totient is φ = 332640000.

The previous prime is 920281951. The next prime is 920281979. The reversal of 920281978 is 879182029.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (920281979) 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, 183403 + ... + 188353.

It is an arithmetic number, because the mean of its divisors is an integer number (28880064).

Almost surely, 2^920281978 is an apocalyptic number.

920281978 is an abundant number, since it is smaller than the sum of its proper divisors (928042118).

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

920281978 is a wasteful number, since it uses less digits than its factorization.

920281978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5059.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 920281978 is about 30336.1496897678. The cubic root of 920281978 is about 972.6881815225.

The spelling of 920281978 in words is "nine hundred twenty million, two hundred eighty-one thousand, nine hundred seventy-eight".