15438192640 has 224 divisors, whose sum is σ = 40514503680. Its totient is φ = 5612765184.

The previous prime is 15438192631. The next prime is 15438192661. The reversal of 15438192640 is 4629183451.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42065737 + ... + 42066103.

It is an arithmetic number, because the mean of its divisors is an integer number (180868320).

Almost surely, 2^15438192640 is an apocalyptic number.

15438192640 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 15438192640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20257251840).

15438192640 is an abundant number, since it is smaller than the sum of its proper divisors (25076311040).

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

15438192640 is an equidigital number, since it uses as much as digits as its factorization.

15438192640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490 (or 466 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 15438192640 in words is "fifteen billion, four hundred thirty-eight million, one hundred ninety-two thousand, six hundred forty".