890388195906 has 32 divisors (see below), whose sum is σ = 1990047237696. Its totient is φ = 263233760000.

The previous prime is 890388195901. The next prime is 890388195929. The reversal of 890388195906 is 609591883098.

890388195906 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×890388195906² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is not an unprimeable number, because it can be changed into a prime (890388195901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164518395 + ... + 164523806.

It is an arithmetic number, because the mean of its divisors is an integer number (62188976178).

Almost surely, 2^890388195906 is an apocalyptic number.

890388195906 is an abundant number, since it is smaller than the sum of its proper divisors (1099659041790).

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

890388195906 is a wasteful number, since it uses less digits than its factorization.

890388195906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329042258.

The product of its (nonzero) digits is 33592320, while the sum is 66.

The spelling of 890388195906 in words is "eight hundred ninety billion, three hundred eighty-eight million, one hundred ninety-five thousand, nine hundred six".