1029788640 has 240 divisors, whose sum is σ = 3662699040. Its totient is φ = 272471040.

The previous prime is 1029788623. The next prime is 1029788653. The reversal of 1029788640 is 468879201.

1029788640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2345541 + ... + 2345979.

It is an arithmetic number, because the mean of its divisors is an integer number (15261246).

Almost surely, 2^1029788640 is an apocalyptic number.

1029788640 is a gapful number since it is divisible by the number (10) 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 1029788640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1831349520).

1029788640 is an abundant number, since it is smaller than the sum of its proper divisors (2632910400).

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

1029788640 is a wasteful number, since it uses less digits than its factorization.

1029788640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647 (or 630 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 1029788640 is about 32090.3200357990. The cubic root of 1029788640 is about 1009.8325507453.

The spelling of 1029788640 in words is "one billion, twenty-nine million, seven hundred eighty-eight thousand, six hundred forty".