861728422 has 4 divisors (see below), whose sum is σ = 1292592636. Its totient is φ = 430864210.

The previous prime is 861728411. The next prime is 861728423. The reversal of 861728422 is 224827168.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×861728422² = 1485151746565220168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861728423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215432104 + ... + 215432107.

It is an arithmetic number, because the mean of its divisors is an integer number (323148159).

Almost surely, 2^861728422 is an apocalyptic number.

861728422 is a deficient number, since it is larger than the sum of its proper divisors (430864214).

861728422 is a wasteful number, since it uses less digits than its factorization.

861728422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430864213.

The product of its digits is 86016, while the sum is 40.

The square root of 861728422 is about 29355.2111557727. The cubic root of 861728422 is about 951.6051982931.

The spelling of 861728422 in words is "eight hundred sixty-one million, seven hundred twenty-eight thousand, four hundred twenty-two".