18929877702890 has 64 divisors (see below), whose sum is σ = 42667105224960. Its totient is φ = 5874456407040.

The previous prime is 18929877702887. The next prime is 18929877702899. The reversal of 18929877702890 is 9820777892981.

It is a super-2 number, since 2×18929877702890² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (77).

It is not an unprimeable number, because it can be changed into a prime (18929877702899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53501087 + ... + 53853746.

It is an arithmetic number, because the mean of its divisors is an integer number (666673519140).

Almost surely, 2^{18929877702890} is an apocalyptic number.

18929877702890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18929877702890 is an abundant number, since it is smaller than the sum of its proper divisors (23737227522070).

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

18929877702890 is a wasteful number, since it uses less digits than its factorization.

18929877702890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107355087.

The product of its (nonzero) digits is 512096256, while the sum is 77.

The spelling of 18929877702890 in words is "eighteen trillion, nine hundred twenty-nine billion, eight hundred seventy-seven million, seven hundred two thousand, eight hundred ninety".