640057741 has 4 divisors (see below), whose sum is σ = 640995552. Its totient is φ = 639119932.

The previous prime is 640057723. The next prime is 640057751. The reversal of 640057741 is 147750046.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 640057741 - 2¹³ = 640049549 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640057697 and 640057706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640057711) 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, 467881 + ... + 469246.

It is an arithmetic number, because the mean of its divisors is an integer number (160248888).

Almost surely, 2^640057741 is an apocalyptic number.

It is an amenable number.

640057741 is a deficient number, since it is larger than the sum of its proper divisors (937811).

640057741 is an equidigital number, since it uses as much as digits as its factorization.

640057741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 937810.

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 640057741 is about 25299.3624623230. The cubic root of 640057741 is about 861.7997917362.

The spelling of 640057741 in words is "six hundred forty million, fifty-seven thousand, seven hundred forty-one".