647690677 has 12 divisors (see below), whose sum is σ = 690250080. Its totient is φ = 607609512.

The previous prime is 647690671. The next prime is 647690683. The reversal of 647690677 is 776096746.

It is an interprime number because it is at equal distance from previous prime (647690671) and next prime (647690683).

It is a de Polignac number, because none of the positive numbers 2^k-647690677 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 (647690671) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28474 + ... + 45892.

It is an arithmetic number, because the mean of its divisors is an integer number (57520840).

Almost surely, 2^647690677 is an apocalyptic number.

It is an amenable number.

647690677 is a deficient number, since it is larger than the sum of its proper divisors (42559403).

647690677 is a wasteful number, since it uses less digits than its factorization.

647690677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17560 (or 17541 counting only the distinct ones).

The product of its (nonzero) digits is 2667168, while the sum is 52.

The square root of 647690677 is about 25449.7677199616. The cubic root of 647690677 is about 865.2120286141.

The spelling of 647690677 in words is "six hundred forty-seven million, six hundred ninety thousand, six hundred seventy-seven".