1072399328 has 96 divisors (see below), whose sum is σ = 2834818560. Its totient is φ = 385666560.

The previous prime is 1072399327. The next prime is 1072399343. The reversal of 1072399328 is 8239932701.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1072399327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15293 + ... + 48771.

It is an arithmetic number, because the mean of its divisors is an integer number (29529360).

Almost surely, 2^1072399328 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 1072399328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1417409280).

1072399328 is an abundant number, since it is smaller than the sum of its proper divisors (1762419232).

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

1072399328 is a wasteful number, since it uses less digits than its factorization.

1072399328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33520 (or 33512 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 1072399328 is about 32747.5087296729. The cubic root of 1072399328 is about 1023.5730540291.

The spelling of 1072399328 in words is "one billion, seventy-two million, three hundred ninety-nine thousand, three hundred twenty-eight".