642778510 has 16 divisors (see below), whose sum is σ = 1262183472. Its totient is φ = 233737600.

The previous prime is 642778489. The next prime is 642778529. The reversal of 642778510 is 15877246.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2921611 + ... + 2921830.

It is an arithmetic number, because the mean of its divisors is an integer number (78886467).

Almost surely, 2^642778510 is an apocalyptic number.

642778510 is a deficient number, since it is larger than the sum of its proper divisors (619404962).

642778510 is a wasteful number, since it uses less digits than its factorization.

642778510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5843459.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 642778510 is about 25353.0769335795. The cubic root of 642778510 is about 863.0191835980.

The spelling of 642778510 in words is "six hundred forty-two million, seven hundred seventy-eight thousand, five hundred ten".