215445854040 has 128 divisors (see below), whose sum is σ = 668875173120. Its totient is φ = 55472601600.

The previous prime is 215445853981. The next prime is 215445854083. The reversal of 215445854040 is 40458544512.

It is a happy number.

215445854040 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 215445853983 and 215445854001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 396435 + ... + 766845.

It is an arithmetic number, because the mean of its divisors is an integer number (5225587290).

Almost surely, 2^215445854040 is an apocalyptic number.

215445854040 is a gapful number since it is divisible by the number (20) 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 215445854040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (334437586560).

215445854040 is an abundant number, since it is smaller than the sum of its proper divisors (453429319080).

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

215445854040 is a wasteful number, since it uses less digits than its factorization.

215445854040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370593 (or 370589 counting only the distinct ones).

The product of its (nonzero) digits is 512000, while the sum is 42.

The spelling of 215445854040 in words is "two hundred fifteen billion, four hundred forty-five million, eight hundred fifty-four thousand, forty".