917020642 has 8 divisors (see below), whose sum is σ = 1376042832. Its totient is φ = 458339700.

The previous prime is 917020633. The next prime is 917020661. The reversal of 917020642 is 246020719.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78484 + ... + 89407.

It is an arithmetic number, because the mean of its divisors is an integer number (172005354).

Almost surely, 2^917020642 is an apocalyptic number.

917020642 is a deficient number, since it is larger than the sum of its proper divisors (459022190).

917020642 is a wasteful number, since it uses less digits than its factorization.

917020642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170624.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 917020642 is about 30282.3486869827. The cubic root of 917020642 is about 971.5378030553.

The spelling of 917020642 in words is "nine hundred seventeen million, twenty thousand, six hundred forty-two".