1215066640 has 40 divisors (see below), whose sum is σ = 2828086848. Its totient is φ = 485500800.

The previous prime is 1215066623. The next prime is 1215066661. The reversal of 1215066640 is 466605121.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70915 + ... + 86365.

Almost surely, 2^1215066640 is an apocalyptic number.

1215066640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215066640 is an abundant number, since it is smaller than the sum of its proper divisors (1613020208).

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

1215066640 is a wasteful number, since it uses less digits than its factorization.

1215066640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16447 (or 16441 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 1215066640 is about 34857.8060124271. The cubic root of 1215066640 is about 1067.0874997451.

The spelling of 1215066640 in words is "one billion, two hundred fifteen million, sixty-six thousand, six hundred forty".