390728884 has 96 divisors (see below), whose sum is σ = 898200576. Its totient is φ = 144322560.

The previous prime is 390728881. The next prime is 390728951. The reversal of 390728884 is 488827093.

It is a super-3 number, since 3×390728884³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390728881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1441669 + ... + 1441939.

It is an arithmetic number, because the mean of its divisors is an integer number (9356256).

Almost surely, 2^390728884 is an apocalyptic number.

390728884 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 390728884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (449100288).

390728884 is an abundant number, since it is smaller than the sum of its proper divisors (507471692).

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

390728884 is a wasteful number, since it uses less digits than its factorization.

390728884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545 (or 543 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 49.

The square root of 390728884 is about 19766.8632817653. The cubic root of 390728884 is about 731.0692306567.

The spelling of 390728884 in words is "three hundred ninety million, seven hundred twenty-eight thousand, eight hundred eighty-four".