111661620 has 48 divisors (see below), whose sum is σ = 357318528. Its totient is φ = 25522560.

The previous prime is 111661609. The next prime is 111661637. The reversal of 111661620 is 26166111.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132511 + ... + 133350.

It is an arithmetic number, because the mean of its divisors is an integer number (7444136).

Almost surely, 2^111661620 is an apocalyptic number.

111661620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111661620 is an abundant number, since it is smaller than the sum of its proper divisors (245656908).

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

111661620 is a wasteful number, since it uses less digits than its factorization.

111661620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265880 (or 265878 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 111661620 is about 10567.0061985408. The cubic root of 111661620 is about 481.5425203104.

The spelling of 111661620 in words is "one hundred eleven million, six hundred sixty-one thousand, six hundred twenty".