864621442 has 16 divisors (see below), whose sum is σ = 1323254592. Its totient is φ = 423591120.

The previous prime is 864621437. The next prime is 864621469. The reversal of 864621442 is 244126468.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18613 + ... + 45559.

It is an arithmetic number, because the mean of its divisors is an integer number (82703412).

Almost surely, 2^864621442 is an apocalyptic number.

864621442 is a deficient number, since it is larger than the sum of its proper divisors (458633150).

864621442 is a wasteful number, since it uses less digits than its factorization.

864621442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27273.

The product of its digits is 73728, while the sum is 37.

The square root of 864621442 is about 29404.4459563516. The cubic root of 864621442 is about 952.6689277705.

The spelling of 864621442 in words is "eight hundred sixty-four million, six hundred twenty-one thousand, four hundred forty-two".