642535770 has 32 divisors (see below), whose sum is σ = 1543681152. Its totient is φ = 171165632.

The previous prime is 642535763. The next prime is 642535771. The reversal of 642535770 is 77535246.

It is not an unprimeable number, because it can be changed into a prime (642535771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19819 + ... + 40961.

It is an arithmetic number, because the mean of its divisors is an integer number (48240036).

Almost surely, 2^642535770 is an apocalyptic number.

642535770 is an abundant number, since it is smaller than the sum of its proper divisors (901145382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642535770 is a wasteful number, since it uses less digits than its factorization.

642535770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22166.

The product of its (nonzero) digits is 176400, while the sum is 39.

The square root of 642535770 is about 25348.2892913901. The cubic root of 642535770 is about 862.9105325621.

It can be divided in two parts, 6425 and 35770, that added together give a triangular number (42195 = T₂₉₀).

The spelling of 642535770 in words is "six hundred forty-two million, five hundred thirty-five thousand, seven hundred seventy".