100551440 has 80 divisors (see below), whose sum is σ = 256965696. Its totient is φ = 36288000.

The previous prime is 100551433. The next prime is 100551463. The reversal of 100551440 is 44155001.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×100551440² = 20221184172147200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143090 + ... + 143790.

Almost surely, 2^100551440 is an apocalyptic number.

100551440 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 100551440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128482848).

100551440 is an abundant number, since it is smaller than the sum of its proper divisors (156414256).

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

100551440 is a wasteful number, since it uses less digits than its factorization.

100551440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888 (or 882 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 100551440 is about 10027.5340936842. The cubic root of 100551440 is about 465.0105057942.

The spelling of 100551440 in words is "one hundred million, five hundred fifty-one thousand, four hundred forty".