1026663990 has 64 divisors (see below), whose sum is σ = 2714694912. Its totient is φ = 246416000.

The previous prime is 1026663959. The next prime is 1026663991. The reversal of 1026663990 is 993666201.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1026663991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17929 + ... + 48731.

It is an arithmetic number, because the mean of its divisors is an integer number (42417108).

Almost surely, 2^1026663990 is an apocalyptic number.

1026663990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1026663990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1357347456).

1026663990 is an abundant number, since it is smaller than the sum of its proper divisors (1688030922).

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

1026663990 is a wasteful number, since it uses less digits than its factorization.

1026663990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30925.

The product of its (nonzero) digits is 104976, while the sum is 42.

The square root of 1026663990 is about 32041.5978066013. The cubic root of 1026663990 is about 1008.8101499797.

The spelling of 1026663990 in words is "one billion, twenty-six million, six hundred sixty-three thousand, nine hundred ninety".