78203421954 has 24 divisors (see below), whose sum is σ = 193646568960. Its totient is φ = 22343834808.

The previous prime is 78203421859. The next prime is 78203422043. The reversal of 78203421954 is 45912430287.

It is a super-2 number, since 2×78203421954² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 310330914 + ... + 310331165.

It is an arithmetic number, because the mean of its divisors is an integer number (8068607040).

Almost surely, 2^78203421954 is an apocalyptic number.

78203421954 is an abundant number, since it is smaller than the sum of its proper divisors (115443147006).

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

78203421954 is a wasteful number, since it uses less digits than its factorization.

78203421954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620662094 (or 620662091 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 78203421954 in words is "seventy-eight billion, two hundred three million, four hundred twenty-one thousand, nine hundred fifty-four".