1215690256 has 60 divisors (see below), whose sum is σ = 2619988560. Its totient is φ = 541939840.

The previous prime is 1215690253. The next prime is 1215690257. The reversal of 1215690256 is 6520965121.

It is not an unprimeable number, because it can be changed into a prime (1215690251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 493155 + ... + 495613.

It is an arithmetic number, because the mean of its divisors is an integer number (43666476).

Almost surely, 2^1215690256 is an apocalyptic number.

1215690256 is a gapful number since it is divisible by the number (16) 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 1215690256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1309994280).

1215690256 is an abundant number, since it is smaller than the sum of its proper divisors (1404298304).

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

1215690256 is a wasteful number, since it uses less digits than its factorization.

1215690256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2584 (or 2525 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 1215690256 is about 34866.7500062739. The cubic root of 1215690256 is about 1067.2700244462.

The spelling of 1215690256 in words is "one billion, two hundred fifteen million, six hundred ninety thousand, two hundred fifty-six".