15478386640 has 40 divisors (see below), whose sum is σ = 36824169888. Its totient is φ = 6047368320.

The previous prime is 15478386611. The next prime is 15478386641. The reversal of 15478386640 is 4668387451.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15478386641) 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, 2246326 + ... + 2253205.

Almost surely, 2^15478386640 is an apocalyptic number.

15478386640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15478386640 is an abundant number, since it is smaller than the sum of its proper divisors (21345783248).

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

15478386640 is a wasteful number, since it uses less digits than its factorization.

15478386640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4499587 (or 4499581 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 52.

The spelling of 15478386640 in words is "fifteen billion, four hundred seventy-eight million, three hundred eighty-six thousand, six hundred forty".