11157720 has 128 divisors (see below), whose sum is σ = 39398400. Its totient is φ = 2474496.

The previous prime is 11157709. The next prime is 11157739. The reversal of 11157720 is 2775111.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30901 + ... + 31259.

It is an arithmetic number, because the mean of its divisors is an integer number (307800).

Almost surely, 2^11157720 is an apocalyptic number.

11157720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11157720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19699200).

11157720 is an abundant number, since it is smaller than the sum of its proper divisors (28240680).

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

11157720 is a wasteful number, since it uses less digits than its factorization.

11157720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417 (or 413 counting only the distinct ones).

The product of its (nonzero) digits is 490, while the sum is 24.

The square root of 11157720 is about 3340.3173501929. The cubic root of 11157720 is about 223.4558966873.

The spelling of 11157720 in words is "eleven million, one hundred fifty-seven thousand, seven hundred twenty".