1215672220 has 48 divisors (see below), whose sum is σ = 2919607488. Its totient is φ = 416517120.

The previous prime is 1215672217. The next prime is 1215672251. The reversal of 1215672220 is 222765121.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 365284 + ... + 368596.

It is an arithmetic number, because the mean of its divisors is an integer number (60825156).

Almost surely, 2^1215672220 is an apocalyptic number.

1215672220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215672220 is an abundant number, since it is smaller than the sum of its proper divisors (1703935268).

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

1215672220 is a wasteful number, since it uses less digits than its factorization.

1215672220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5950 (or 5948 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 1215672220 is about 34866.4913634854. The cubic root of 1215672220 is about 1067.2647464084.

The spelling of 1215672220 in words is "one billion, two hundred fifteen million, six hundred seventy-two thousand, two hundred twenty".