981621536 has 48 divisors (see below), whose sum is σ = 2223547200. Its totient is φ = 417857280.

The previous prime is 981621521. The next prime is 981621547. The reversal of 981621536 is 635126189.

It is a junction number, because it is equal to n+sod(n) for n = 981621493 and 981621502.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18671 + ... + 48081.

It is an arithmetic number, because the mean of its divisors is an integer number (46323900).

Almost surely, 2^981621536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 981621536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1111773600).

981621536 is an abundant number, since it is smaller than the sum of its proper divisors (1241925664).

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

981621536 is a wasteful number, since it uses less digits than its factorization.

981621536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29577 (or 29569 counting only the distinct ones).

The product of its digits is 77760, while the sum is 41.

The square root of 981621536 is about 31330.8400142735. The cubic root of 981621536 is about 993.8359276146.

The spelling of 981621536 in words is "nine hundred eighty-one million, six hundred twenty-one thousand, five hundred thirty-six".