1216765040 has 20 divisors (see below), whose sum is σ = 2828978904. Its totient is φ = 486705984.

The previous prime is 1216765007. The next prime is 1216765051. The reversal of 1216765040 is 405676121.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 1216764988 and 1216765006.

It is a congruent number.

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, 7604702 + ... + 7604861.

Almost surely, 2^1216765040 is an apocalyptic number.

1216765040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216765040 is an abundant number, since it is smaller than the sum of its proper divisors (1612213864).

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

1216765040 is a wasteful number, since it uses less digits than its factorization.

1216765040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15209576 (or 15209570 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 1216765040 is about 34882.1593368301. The cubic root of 1216765040 is about 1067.5844540094.

The spelling of 1216765040 in words is "one billion, two hundred sixteen million, seven hundred sixty-five thousand, forty".