15478444140 has 96 divisors (see below), whose sum is σ = 43711799040. Its totient is φ = 4092270336.

The previous prime is 15478444139. The next prime is 15478444141. The reversal of 15478444140 is 4144487451.

It is an interprime number because it is at equal distance from previous prime (15478444139) and next prime (15478444141).

It is a junction number, because it is equal to n+sod(n) for n = 15478444092 and 15478444101.

It is not an unprimeable number, because it can be changed into a prime (15478444141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4565566 + ... + 4568954.

It is an arithmetic number, because the mean of its divisors is an integer number (455331240).

Almost surely, 2^15478444140 is an apocalyptic number.

15478444140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15478444140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21855899520).

15478444140 is an abundant number, since it is smaller than the sum of its proper divisors (28233354900).

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

15478444140 is a wasteful number, since it uses less digits than its factorization.

15478444140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4031 (or 4029 counting only the distinct ones).

The product of its (nonzero) digits is 286720, while the sum is 42.

The spelling of 15478444140 in words is "fifteen billion, four hundred seventy-eight million, four hundred forty-four thousand, one hundred forty".