73478821918 has 16 divisors (see below), whose sum is σ = 114498347904. Its totient is φ = 35327803680.

The previous prime is 73478821907. The next prime is 73478821919. The reversal of 73478821918 is 81912887437.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73478821919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3764605 + ... + 3784072.

It is an arithmetic number, because the mean of its divisors is an integer number (7156146744).

Almost surely, 2^73478821918 is an apocalyptic number.

73478821918 is a deficient number, since it is larger than the sum of its proper divisors (41019525986).

73478821918 is a wasteful number, since it uses less digits than its factorization.

73478821918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7548867.

The product of its digits is 5419008, while the sum is 58.

The spelling of 73478821918 in words is "seventy-three billion, four hundred seventy-eight million, eight hundred twenty-one thousand, nine hundred eighteen".