1156578612 has 48 divisors (see below), whose sum is σ = 3265637760. Its totient is φ = 311012352.

The previous prime is 1156578571. The next prime is 1156578623. The reversal of 1156578612 is 2168756511.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 403537 + ... + 406392.

It is an arithmetic number, because the mean of its divisors is an integer number (68034120).

Almost surely, 2^1156578612 is an apocalyptic number.

1156578612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1156578612 is an abundant number, since it is smaller than the sum of its proper divisors (2109059148).

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

1156578612 is a wasteful number, since it uses less digits than its factorization.

1156578612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809960 (or 809958 counting only the distinct ones).

The product of its digits is 100800, while the sum is 42.

The square root of 1156578612 is about 34008.5079355152. The cubic root of 1156578612 is about 1049.6835363754.

The spelling of 1156578612 in words is "one billion, one hundred fifty-six million, five hundred seventy-eight thousand, six hundred twelve".