128891263790 has 32 divisors (see below), whose sum is σ = 239343310080. Its totient is φ = 49938107904.

The previous prime is 128891263777. The next prime is 128891263817. The reversal of 128891263790 is 97362198821.

It is a super-2 number, since 2×128891263790² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 698555 + ... + 863574.

It is an arithmetic number, because the mean of its divisors is an integer number (7479478440).

Almost surely, 2^128891263790 is an apocalyptic number.

128891263790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128891263790 is a deficient number, since it is larger than the sum of its proper divisors (110452046290).

128891263790 is a wasteful number, since it uses less digits than its factorization.

128891263790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1562396.

The product of its (nonzero) digits is 2612736, while the sum is 56.

The spelling of 128891263790 in words is "one hundred twenty-eight billion, eight hundred ninety-one million, two hundred sixty-three thousand, seven hundred ninety".