1171257720 has 32 divisors (see below), whose sum is σ = 3513773520. Its totient is φ = 312335360.

The previous prime is 1171257709. The next prime is 1171257743. The reversal of 1171257720 is 277521711.

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 7 ways as a sum of consecutive naturals, for example, 4880121 + ... + 4880360.

Almost surely, 2^1171257720 is an apocalyptic number.

1171257720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1171257720 is an abundant number, since it is smaller than the sum of its proper divisors (2342515800).

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

1171257720 is a wasteful number, since it uses less digits than its factorization.

1171257720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9760495 (or 9760491 counting only the distinct ones).

The product of its (nonzero) digits is 6860, while the sum is 33.

The square root of 1171257720 is about 34223.6427050073. The cubic root of 1171257720 is about 1054.1056847627.

The spelling of 1171257720 in words is "one billion, one hundred seventy-one million, two hundred fifty-seven thousand, seven hundred twenty".