100720134 has 24 divisors (see below), whose sum is σ = 218651472. Its totient is φ = 33508080.

The previous prime is 100720133. The next prime is 100720141. The reversal of 100720134 is 431027001.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100720133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4567 + ... + 14909.

It is an arithmetic number, because the mean of its divisors is an integer number (9110478).

Almost surely, 2^100720134 is an apocalyptic number.

100720134 is an abundant number, since it is smaller than the sum of its proper divisors (117931338).

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

100720134 is a wasteful number, since it uses less digits than its factorization.

100720134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10892 (or 10889 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 100720134 is about 10035.9421082428. The cubic root of 100720134 is about 465.2704081043.

Adding to 100720134 its reverse (431027001), we get a palindrome (531747135).

The spelling of 100720134 in words is "one hundred million, seven hundred twenty thousand, one hundred thirty-four".