1020694688 has 96 divisors (see below), whose sum is σ = 2315673360. Its totient is φ = 438681600.

The previous prime is 1020694663. The next prime is 1020694693. The reversal of 1020694688 is 8864960201.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 494083984 + 526610704 = 22228^2 + 22948^2 .

It is a super-2 number, since 2×1020694688² = 2083635292222834688, which contains 22 as substring.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 713558 + ... + 714986.

Almost surely, 2^1020694688 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 1020694688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1157836680).

1020694688 is an abundant number, since it is smaller than the sum of its proper divisors (1294978672).

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

1020694688 is a wasteful number, since it uses less digits than its factorization.

1020694688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1570 (or 1562 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 1020694688 is about 31948.3127567013. The cubic root of 1020694688 is about 1006.8511834238.

The spelling of 1020694688 in words is "one billion, twenty million, six hundred ninety-four thousand, six hundred eighty-eight".