215142644 has 12 divisors (see below), whose sum is σ = 392869344. Its totient is φ = 102894264.

The previous prime is 215142617. The next prime is 215142649. The reversal of 215142644 is 446241512.

215142644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215142649) 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, 1169162 + ... + 1169345.

It is an arithmetic number, because the mean of its divisors is an integer number (32739112).

Almost surely, 2^215142644 is an apocalyptic number.

It is an amenable number.

215142644 is a deficient number, since it is larger than the sum of its proper divisors (177726700).

215142644 is a wasteful number, since it uses less digits than its factorization.

215142644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2338534 (or 2338532 counting only the distinct ones).

The product of its digits is 7680, while the sum is 29.

The square root of 215142644 is about 14667.7416121228. The cubic root of 215142644 is about 599.2050992048.

The spelling of 215142644 in words is "two hundred fifteen million, one hundred forty-two thousand, six hundred forty-four".