1215630664 has 16 divisors (see below), whose sum is σ = 2279692800. Its totient is φ = 607712592.

The previous prime is 1215630653. The next prime is 1215630673. The reversal of 1215630664 is 4660365121.

It is a super-2 number, since 2×1215630664² = 2955515822514161792, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65689 + ... + 82135.

It is an arithmetic number, because the mean of its divisors is an integer number (142480800).

Almost surely, 2^1215630664 is an apocalyptic number.

It is an amenable number.

1215630664 is a deficient number, since it is larger than the sum of its proper divisors (1064062136).

1215630664 is a wasteful number, since it uses less digits than its factorization.

1215630664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25692 (or 25688 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 1215630664 is about 34865.8954280540. The cubic root of 1215630664 is about 1067.2525853016.

Adding to 1215630664 its reverse (4660365121), we get a palindrome (5875995785).

The spelling of 1215630664 in words is "one billion, two hundred fifteen million, six hundred thirty thousand, six hundred sixty-four".