1090000640 has 72 divisors (see below), whose sum is σ = 2638109040. Its totient is φ = 431456256.

The previous prime is 1090000627. The next prime is 1090000651. The reversal of 1090000640 is 460000901.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119771 + ... + 128549.

Almost surely, 2^1090000640 is an apocalyptic number.

1090000640 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 1090000640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1319054520).

1090000640 is an abundant number, since it is smaller than the sum of its proper divisors (1548108400).

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

1090000640 is an frugal number, since it uses more digits than its factorization.

1090000640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8897 (or 8883 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1090000640 is about 33015.1577309575. The cubic root of 1090000640 is about 1029.1426679938.

The spelling of 1090000640 in words is "one billion, ninety million, six hundred forty", and thus it is an aban number.