981215028 has 18 divisors (see below), whose sum is σ = 2480293634. Its totient is φ = 327071664.

The previous prime is 981214987. The next prime is 981215033. The reversal of 981215028 is 820512189.

It can be written as a sum of positive squares in only one way, i.e., 759443364 + 221771664 = 27558^2 + 14892^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 27255973 = 981215028 / (9 + 8 + 1 + 2 + 1 + 5 + 0 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 981214983 and 981215001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13627951 + ... + 13628022.

Almost surely, 2^981215028 is an apocalyptic number.

It is an amenable number.

981215028 is an abundant number, since it is smaller than the sum of its proper divisors (1499078606).

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

981215028 is a wasteful number, since it uses less digits than its factorization.

981215028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27255983 (or 27255978 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 981215028 is about 31324.3519964899. The cubic root of 981215028 is about 993.6987199360.

The spelling of 981215028 in words is "nine hundred eighty-one million, two hundred fifteen thousand, twenty-eight".