215440638070 has 32 divisors (see below), whose sum is σ = 469262299968. Its totient is φ = 69520339968.

The previous prime is 215440638043. The next prime is 215440638089. The reversal of 215440638070 is 70836044512.

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, 90520087 + ... + 90522466.

It is an arithmetic number, because the mean of its divisors is an integer number (14664446874).

Almost surely, 2^215440638070 is an apocalyptic number.

215440638070 is an abundant number, since it is smaller than the sum of its proper divisors (253821661898).

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

215440638070 is a wasteful number, since it uses less digits than its factorization.

215440638070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181042584.

The product of its (nonzero) digits is 161280, while the sum is 40.

The spelling of 215440638070 in words is "two hundred fifteen billion, four hundred forty million, six hundred thirty-eight thousand, seventy".