640041770 has 16 divisors (see below), whose sum is σ = 1176588288. Its totient is φ = 250569360.

The previous prime is 640041751. The next prime is 640041781. The reversal of 640041770 is 77140046.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 680426 + ... + 681365.

It is an arithmetic number, because the mean of its divisors is an integer number (73536768).

Almost surely, 2^640041770 is an apocalyptic number.

640041770 is a deficient number, since it is larger than the sum of its proper divisors (536546518).

640041770 is a wasteful number, since it uses less digits than its factorization.

640041770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1361845.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 640041770 is about 25299.0468199891. The cubic root of 640041770 is about 861.7926236751.

The spelling of 640041770 in words is "six hundred forty million, forty-one thousand, seven hundred seventy".