1215155028 has 24 divisors (see below), whose sum is σ = 2837725632. Its totient is φ = 404713984.

The previous prime is 1215155027. The next prime is 1215155033. The reversal of 1215155028 is 8205515121.

It is a junction number, because it is equal to n+sod(n) for n = 1215154986 and 1215155004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215155027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27000 + ... + 56207.

It is an arithmetic number, because the mean of its divisors is an integer number (118238568).

Almost surely, 2^1215155028 is an apocalyptic number.

It is an amenable number.

1215155028 is an abundant number, since it is smaller than the sum of its proper divisors (1622570604).

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

1215155028 is a wasteful number, since it uses less digits than its factorization.

1215155028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84431 (or 84429 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 30.

The square root of 1215155028 is about 34859.0738259065. The cubic root of 1215155028 is about 1067.1133736190.

The spelling of 1215155028 in words is "one billion, two hundred fifteen million, one hundred fifty-five thousand, twenty-eight".