1216857070 has 48 divisors (see below), whose sum is σ = 2592797760. Its totient is φ = 408450240.

The previous prime is 1216857053. The next prime is 1216857091. The reversal of 1216857070 is 707586121.

It is a super-2 number, since 2×1216857070² = 2961482257617969800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22950 + ... + 54409.

It is an arithmetic number, because the mean of its divisors is an integer number (54016620).

Almost surely, 2^1216857070 is an apocalyptic number.

1216857070 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1216857070 is an abundant number, since it is smaller than the sum of its proper divisors (1375940690).

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

1216857070 is a wasteful number, since it uses less digits than its factorization.

1216857070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77401 (or 77390 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 37.

The square root of 1216857070 is about 34883.4784676070. The cubic root of 1216857070 is about 1067.6113689072.

The spelling of 1216857070 in words is "one billion, two hundred sixteen million, eight hundred fifty-seven thousand, seventy".