987628111 has 4 divisors (see below), whose sum is σ = 987857424. Its totient is φ = 987398800.

The previous prime is 987628099. The next prime is 987628123. The reversal of 987628111 is 111826789.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (987628099) and next prime (987628123).

It is a cyclic number.

It is not a de Polignac number, because 987628111 - 2⁷ = 987627983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987623111) 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, 108070 + ... + 116851.

It is an arithmetic number, because the mean of its divisors is an integer number (246964356).

Almost surely, 2^987628111 is an apocalyptic number.

987628111 is a deficient number, since it is larger than the sum of its proper divisors (229313).

987628111 is a wasteful number, since it uses less digits than its factorization.

987628111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229312.

The product of its digits is 48384, while the sum is 43.

The square root of 987628111 is about 31426.5510516188. The cubic root of 987628111 is about 995.8589120620.

The spelling of 987628111 in words is "nine hundred eighty-seven million, six hundred twenty-eight thousand, one hundred eleven".