1026320640 has 72 divisors (see below), whose sum is σ = 3277823808. Its totient is φ = 273684480.

The previous prime is 1026320621. The next prime is 1026320641. The reversal of 1026320640 is 460236201.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1026320640.

It is not an unprimeable number, because it can be changed into a prime (1026320641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129796 + ... + 137475.

Almost surely, 2^1026320640 is an apocalyptic number.

1026320640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1026320640 is an abundant number, since it is smaller than the sum of its proper divisors (2251503168).

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

1026320640 is an equidigital number, since it uses as much as digits as its factorization.

1026320640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267295 (or 267281 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 1026320640 is about 32036.2394796892. The cubic root of 1026320640 is about 1008.6976777433.

Adding to 1026320640 its reverse (460236201), we get a palindrome (1486556841).

It can be divided in two parts, 10263 and 20640, that added together give a palindrome (30903).

The spelling of 1026320640 in words is "one billion, twenty-six million, three hundred twenty thousand, six hundred forty".