100649560 has 128 divisors (see below), whose sum is σ = 262103040. Its totient is φ = 34444800.

The previous prime is 100649533. The next prime is 100649561. The reversal of 100649560 is 65946001.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100649561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 641002 + ... + 641158.

It is an arithmetic number, because the mean of its divisors is an integer number (2047680).

Almost surely, 2^100649560 is an apocalyptic number.

100649560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 100649560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131051520).

100649560 is an abundant number, since it is smaller than the sum of its proper divisors (161453480).

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

100649560 is a wasteful number, since it uses less digits than its factorization.

100649560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257 (or 253 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 100649560 is about 10032.4254295758. The cubic root of 100649560 is about 465.1617119751.

The spelling of 100649560 in words is "one hundred million, six hundred forty-nine thousand, five hundred sixty".