4445388978 has 8 divisors (see below), whose sum is σ = 8890777968. Its totient is φ = 1481796324.

The previous prime is 4445388971. The next prime is 4445388989. The reversal of 4445388978 is 8798835444.

It is a happy number.

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

4445388978 is an admirable number.

It is a super-2 number, since 2×4445388978² = 39522966331447768968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (4445388971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 370449076 + ... + 370449087.

It is an arithmetic number, because the mean of its divisors is an integer number (1111347246).

Almost surely, 2^4445388978 is an apocalyptic number.

4445388978 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.

4445388978 is a wasteful number, since it uses less digits than its factorization.

4445388978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740898168.

The product of its digits is 30965760, while the sum is 60.

The square root of 4445388978 is about 66673.7502920002. The cubic root of 4445388978 is about 1644.2578456401.

The spelling of 4445388978 in words is "four billion, four hundred forty-five million, three hundred eighty-eight thousand, nine hundred seventy-eight".