3217999428 has 288 divisors, whose sum is σ = 10461394944. Its totient is φ = 843913728.

The previous prime is 3217999403. The next prime is 3217999457. The reversal of 3217999428 is 8249997123.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4973401 + ... + 4974047.

It is an arithmetic number, because the mean of its divisors is an integer number (36324288).

Almost surely, 2^3217999428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3217999428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5230697472).

3217999428 is an abundant number, since it is smaller than the sum of its proper divisors (7243395516).

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

3217999428 is a wasteful number, since it uses less digits than its factorization.

3217999428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733 (or 719 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The square root of 3217999428 is about 56727.4133730774. The cubic root of 3217999428 is about 1476.3703710649.

The spelling of 3217999428 in words is "three billion, two hundred seventeen million, nine hundred ninety-nine thousand, four hundred twenty-eight".