100642635 has 32 divisors (see below), whose sum is σ = 189449280. Its totient is φ = 50517504.

The previous prime is 100642631. The next prime is 100642637. The reversal of 100642635 is 536246001.

100642635 is a `hidden beast` number, since 10 + 0 + 642 + 6 + 3 + 5 = 666.

It is not a de Polignac number, because 100642635 - 2² = 100642631 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 100642599 and 100642608.

It is not an unprimeable number, because it can be changed into a prime (100642631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19632 + ... + 24221.

It is an arithmetic number, because the mean of its divisors is an integer number (5920290).

Almost surely, 2^100642635 is an apocalyptic number.

100642635 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

100642635 is a deficient number, since it is larger than the sum of its proper divisors (88806645).

100642635 is a wasteful number, since it uses less digits than its factorization.

100642635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43884 (or 43878 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 100642635 is about 10032.0802927409. The cubic root of 100642635 is about 465.1510435439.

Adding to 100642635 its reverse (536246001), we get a palindrome (636888636).

The spelling of 100642635 in words is "one hundred million, six hundred forty-two thousand, six hundred thirty-five".