1156505720 has 16 divisors (see below), whose sum is σ = 2602137960. Its totient is φ = 462602272.

The previous prime is 1156505719. The next prime is 1156505729. The reversal of 1156505720 is 275056511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156505729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14456282 + ... + 14456361.

Almost surely, 2^1156505720 is an apocalyptic number.

1156505720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1156505720 is an abundant number, since it is smaller than the sum of its proper divisors (1445632240).

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

1156505720 is a wasteful number, since it uses less digits than its factorization.

1156505720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28912654 (or 28912650 counting only the distinct ones).

The product of its (nonzero) digits is 10500, while the sum is 32.

The square root of 1156505720 is about 34007.4362456213. The cubic root of 1156505720 is about 1049.6614842241.

The spelling of 1156505720 in words is "one billion, one hundred fifty-six million, five hundred five thousand, seven hundred twenty".