45219978 has 48 divisors (see below), whose sum is σ = 105114240. Its totient is φ = 14408856.

The previous prime is 45219947. The next prime is 45219991. The reversal of 45219978 is 87991254.

45219978 is a `hidden beast` number, since 452 + 199 + 7 + 8 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27775 + ... + 29357.

It is an arithmetic number, because the mean of its divisors is an integer number (2189880).

Almost surely, 2^45219978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 45219978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52557120).

45219978 is an abundant number, since it is smaller than the sum of its proper divisors (59894262).

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

45219978 is a wasteful number, since it uses less digits than its factorization.

45219978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1640 (or 1611 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 45219978 is about 6724.5801355921. The cubic root of 45219978 is about 356.2679725005.

The spelling of 45219978 in words is "forty-five million, two hundred nineteen thousand, nine hundred seventy-eight".