111428690 has 8 divisors (see below), whose sum is σ = 200571660. Its totient is φ = 44571472.

The previous prime is 111428687. The next prime is 111428699. The reversal of 111428690 is 96824111.

It can be written as a sum of positive squares in 2 ways, for example, as 100781521 + 10647169 = 10039^2 + 3263^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×111428690² = 24832705910232200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (111428699) 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, 5571425 + ... + 5571444.

Almost surely, 2^111428690 is an apocalyptic number.

111428690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

111428690 is a deficient number, since it is larger than the sum of its proper divisors (89142970).

111428690 is a wasteful number, since it uses less digits than its factorization.

111428690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11142876.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 111428690 is about 10555.9788745526. The cubic root of 111428690 is about 481.2074490967.

The spelling of 111428690 in words is "one hundred eleven million, four hundred twenty-eight thousand, six hundred ninety".