215797642 has 8 divisors (see below), whose sum is σ = 334858500. Its totient is φ = 104178144.

The previous prime is 215797627. The next prime is 215797651. The reversal of 215797642 is 246797512.

It can be written as a sum of positive squares in 2 ways, for example, as 194351481 + 21446161 = 13941^2 + 4631^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1860267 + ... + 1860382.

Almost surely, 2^215797642 is an apocalyptic number.

215797642 is a deficient number, since it is larger than the sum of its proper divisors (119060858).

215797642 is a wasteful number, since it uses less digits than its factorization.

215797642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3720680.

The product of its digits is 211680, while the sum is 43.

The square root of 215797642 is about 14690.0524845897. The cubic root of 215797642 is about 599.8125729394.

It can be divided in two parts, 2157 and 97642, that added together give a palindrome (99799).

The spelling of 215797642 in words is "two hundred fifteen million, seven hundred ninety-seven thousand, six hundred forty-two".