215680642 has 8 divisors (see below), whose sum is σ = 327156300. Its totient is φ = 106628544.

The previous prime is 215680639. The next prime is 215680643. The reversal of 215680642 is 246086512.

215680642 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 183087961 + 32592681 = 13531^2 + 5709^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 215680598 and 215680607.

It is not an unprimeable number, because it can be changed into a prime (215680643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 605667 + ... + 606022.

Almost surely, 2^215680642 is an apocalyptic number.

215680642 is a deficient number, since it is larger than the sum of its proper divisors (111475658).

215680642 is a wasteful number, since it uses less digits than its factorization.

215680642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1211780.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 215680642 is about 14686.0696580127. The cubic root of 215680642 is about 599.7041522957.

The spelling of 215680642 in words is "two hundred fifteen million, six hundred eighty thousand, six hundred forty-two".