640088438 has 8 divisors (see below), whose sum is σ = 1047417480. Its totient is φ = 290949280.

The previous prime is 640088431. The next prime is 640088461. The reversal of 640088438 is 834880046.

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

It is a super-2 number, since 2×640088438² = 819426416922559688, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 640088395 and 640088404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640088431) by changing a digit.

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, 14547443 + ... + 14547486.

It is an arithmetic number, because the mean of its divisors is an integer number (130927185).

Almost surely, 2^640088438 is an apocalyptic number.

640088438 is a deficient number, since it is larger than the sum of its proper divisors (407329042).

640088438 is a wasteful number, since it uses less digits than its factorization.

640088438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29094942.

The product of its (nonzero) digits is 147456, while the sum is 41.

The square root of 640088438 is about 25299.9691304159. The cubic root of 640088438 is about 861.8135687460.

The spelling of 640088438 in words is "six hundred forty million, eighty-eight thousand, four hundred thirty-eight".