15278545464 has 256 divisors, whose sum is σ = 48048430080. Its totient is φ = 3941498880.

The previous prime is 15278545459. The next prime is 15278545481. The reversal of 15278545464 is 46454587251.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 28241034 + ... + 28241574.

It is an arithmetic number, because the mean of its divisors is an integer number (187689180).

Almost surely, 2^15278545464 is an apocalyptic number.

15278545464 is a gapful number since it is divisible by the number (14) 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 15278545464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24024215040).

15278545464 is an abundant number, since it is smaller than the sum of its proper divisors (32769884616).

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

15278545464 is a wasteful number, since it uses less digits than its factorization.

15278545464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830 (or 826 counting only the distinct ones).

The product of its digits is 5376000, while the sum is 51.

The spelling of 15278545464 in words is "fifteen billion, two hundred seventy-eight million, five hundred forty-five thousand, four hundred sixty-four".