100720458 has 48 divisors (see below), whose sum is σ = 225628416. Its totient is φ = 32454240.

The previous prime is 100720453. The next prime is 100720481. The reversal of 100720458 is 854027001.

It is a super-2 number, since 2×100720458² = 20289221319459528, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (100720453) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66991 + ... + 68477.

It is an arithmetic number, because the mean of its divisors is an integer number (4700592).

Almost surely, 2^100720458 is an apocalyptic number.

100720458 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

100720458 is an abundant number, since it is smaller than the sum of its proper divisors (124907958).

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

100720458 is a wasteful number, since it uses less digits than its factorization.

100720458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1619 (or 1616 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 100720458 is about 10035.9582502121. The cubic root of 100720458 is about 465.2709070031.

Adding to 100720458 its reverse (854027001), we get a palindrome (954747459).

The spelling of 100720458 in words is "one hundred million, seven hundred twenty thousand, four hundred fifty-eight".