1216005304 has 8 divisors (see below), whose sum is σ = 2280009960. Its totient is φ = 608002648.

The previous prime is 1216005283. The next prime is 1216005337. The reversal of 1216005304 is 4035006121.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1216005304² = 2957337798712264832, 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 as a sum of consecutive naturals, namely, 76000324 + ... + 76000339.

It is an arithmetic number, because the mean of its divisors is an integer number (285001245).

Almost surely, 2^1216005304 is an apocalyptic number.

It is an amenable number.

1216005304 is a deficient number, since it is larger than the sum of its proper divisors (1064004656).

1216005304 is a wasteful number, since it uses less digits than its factorization.

1216005304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152000669 (or 152000665 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1216005304 is about 34871.2675995582. The cubic root of 1216005304 is about 1067.3622113727.

The spelling of 1216005304 in words is "one billion, two hundred sixteen million, five thousand, three hundred four".