1216257760 has 48 divisors (see below), whose sum is σ = 2875503456. Its totient is φ = 486148608.

The previous prime is 1216257719. The next prime is 1216257769. The reversal of 1216257760 is 677526121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216257769) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 398962 + ... + 401998.

It is an arithmetic number, because the mean of its divisors is an integer number (59906322).

Almost surely, 2^1216257760 is an apocalyptic number.

1216257760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216257760 is an abundant number, since it is smaller than the sum of its proper divisors (1659245696).

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

1216257760 is a wasteful number, since it uses less digits than its factorization.

1216257760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5555 (or 5547 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 1216257760 is about 34874.8872399611. The cubic root of 1216257760 is about 1067.4360716177.

The spelling of 1216257760 in words is "one billion, two hundred sixteen million, two hundred fifty-seven thousand, seven hundred sixty".