15804878490 has 512 divisors, whose sum is σ = 49766400000. Its totient is φ = 3544611840.

The previous prime is 15804878483. The next prime is 15804878491. The reversal of 15804878490 is 9487840851.

15804878490 is a `hidden beast` number, since 1 + 5 + 80 + 4 + 8 + 78 + 490 = 666.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (15804878491) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 106072936 + ... + 106073084.

It is an arithmetic number, because the mean of its divisors is an integer number (97200000).

Almost surely, 2^15804878490 is an apocalyptic number.

15804878490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 15804878490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24883200000).

15804878490 is an abundant number, since it is smaller than the sum of its proper divisors (33961521510).

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

15804878490 is a wasteful number, since it uses less digits than its factorization.

15804878490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267 (or 261 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 54.

The spelling of 15804878490 in words is "fifteen billion, eight hundred four million, eight hundred seventy-eight thousand, four hundred ninety".