42640688 has 10 divisors (see below), whose sum is σ = 82616364. Its totient is φ = 21320336.

The previous prime is 42640679. The next prime is 42640711. The reversal of 42640688 is 88604624.

It is a happy number.

It is a super-2 number, since 2×42640688² = 3636456546226688, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1332506 + ... + 1332537.

Almost surely, 2^42640688 is an apocalyptic number.

It is an amenable number.

42640688 is a deficient number, since it is larger than the sum of its proper divisors (39975676).

42640688 is a wasteful number, since it uses less digits than its factorization.

42640688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2665051 (or 2665045 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 38.

The square root of 42640688 is about 6529.9837672080. The cubic root of 42640688 is about 349.3612513217.

It can be divided in two parts, 426 and 40688, that added together give a palindrome (41114).

The spelling of 42640688 in words is "forty-two million, six hundred forty thousand, six hundred eighty-eight".