642501770 has 8 divisors (see below), whose sum is σ = 1156503204. Its totient is φ = 257000704.

The previous prime is 642501767. The next prime is 642501773. The reversal of 642501770 is 77105246.

It is an interprime number because it is at equal distance from previous prime (642501767) and next prime (642501773).

It can be written as a sum of positive squares in 2 ways, for example, as 634384969 + 8116801 = 25187^2 + 2849^2 .

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

It is not an unprimeable number, because it can be changed into a prime (642501773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32125079 + ... + 32125098.

Almost surely, 2^642501770 is an apocalyptic number.

642501770 is a deficient number, since it is larger than the sum of its proper divisors (514001434).

642501770 is a wasteful number, since it uses less digits than its factorization.

642501770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64250184.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 642501770 is about 25347.6186258197. The cubic root of 642501770 is about 862.8953118917.

The spelling of 642501770 in words is "six hundred forty-two million, five hundred one thousand, seven hundred seventy".