15250721640 has 256 divisors, whose sum is σ = 60044544000. Its totient is φ = 3002158080.

The previous prime is 15250721639. The next prime is 15250721669. The reversal of 15250721640 is 4612705251.

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 132126 + ... + 218994.

It is an arithmetic number, because the mean of its divisors is an integer number (234549000).

Almost surely, 2^15250721640 is an apocalyptic number.

15250721640 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 15250721640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30022272000).

15250721640 is an abundant number, since it is smaller than the sum of its proper divisors (44793822360).

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

15250721640 is a wasteful number, since it uses less digits than its factorization.

15250721640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86920 (or 86916 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 33.

The spelling of 15250721640 in words is "fifteen billion, two hundred fifty million, seven hundred twenty-one thousand, six hundred forty".