647642701 has 4 divisors (see below), whose sum is σ = 647733312. Its totient is φ = 647552092.

The previous prime is 647642689. The next prime is 647642771. The reversal of 647642701 is 107246746.

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 647642701 - 2¹⁷ = 647511629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647642771) 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, 33571 + ... + 49216.

It is an arithmetic number, because the mean of its divisors is an integer number (161933328).

Almost surely, 2^647642701 is an apocalyptic number.

It is an amenable number.

647642701 is a deficient number, since it is larger than the sum of its proper divisors (90611).

647642701 is an equidigital number, since it uses as much as digits as its factorization.

647642701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90610.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 647642701 is about 25448.8251398763. The cubic root of 647642701 is about 865.1906653107.

The spelling of 647642701 in words is "six hundred forty-seven million, six hundred forty-two thousand, seven hundred one".