42640641 has 16 divisors (see below), whose sum is σ = 66888000. Its totient is φ = 26754624.

The previous prime is 42640639. The next prime is 42640651. The reversal of 42640641 is 14604624.

It is not a de Polignac number, because 42640641 - 2¹ = 42640639 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42640651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45991 + ... + 46908.

It is an arithmetic number, because the mean of its divisors is an integer number (4180500).

Almost surely, 2^42640641 is an apocalyptic number.

It is an amenable number.

42640641 is a deficient number, since it is larger than the sum of its proper divisors (24247359).

42640641 is a wasteful number, since it uses less digits than its factorization.

42640641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92925 (or 92919 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 42640641 is about 6529.9801684232. The cubic root of 42640641 is about 349.3611229625.

The spelling of 42640641 in words is "forty-two million, six hundred forty thousand, six hundred forty-one".