215380437640 has 32 divisors (see below), whose sum is σ = 485127711000. Its totient is φ = 86059423744.

The previous prime is 215380437607. The next prime is 215380437677. The reversal of 215380437640 is 46734083512.

It can be written as a sum of positive squares in 4 ways, for example, as 144094641604 + 71285796036 = 379598^2 + 266994^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2860855 + ... + 2935174.

Almost surely, 2^215380437640 is an apocalyptic number.

215380437640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215380437640 is an abundant number, since it is smaller than the sum of its proper divisors (269747273360).

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

215380437640 is a wasteful number, since it uses less digits than its factorization.

215380437640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5796969 (or 5796965 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 43.

The spelling of 215380437640 in words is "two hundred fifteen billion, three hundred eighty million, four hundred thirty-seven thousand, six hundred forty".