640061642 has 8 divisors (see below), whose sum is σ = 1047373632. Its totient is φ = 290937100.

The previous prime is 640061633. The next prime is 640061647. The reversal of 640061642 is 246160046.

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

It is not an unprimeable number, because it can be changed into a prime (640061647) 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, 14546834 + ... + 14546877.

It is an arithmetic number, because the mean of its divisors is an integer number (130921704).

Almost surely, 2^640061642 is an apocalyptic number.

640061642 is a deficient number, since it is larger than the sum of its proper divisors (407311990).

640061642 is a wasteful number, since it uses less digits than its factorization.

640061642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29093724.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 640061642 is about 25299.4395590100. The cubic root of 640061642 is about 861.8015425544.

The spelling of 640061642 in words is "six hundred forty million, sixty-one thousand, six hundred forty-two".