15530620890 has 64 divisors (see below), whose sum is σ = 38198324736. Its totient is φ = 4039033152.

The previous prime is 15530620873. The next prime is 15530620891. The reversal of 15530620890 is 9802603551.

It is not an unprimeable number, because it can be changed into a prime (15530620891) 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, 872257 + ... + 889883.

It is an arithmetic number, because the mean of its divisors is an integer number (596848824).

Almost surely, 2^15530620890 is an apocalyptic number.

15530620890 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 15530620890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19099162368).

15530620890 is an abundant number, since it is smaller than the sum of its proper divisors (22667703846).

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

15530620890 is a wasteful number, since it uses less digits than its factorization.

15530620890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18363.

The product of its (nonzero) digits is 64800, while the sum is 39.

The spelling of 15530620890 in words is "fifteen billion, five hundred thirty million, six hundred twenty thousand, eight hundred ninety".