684781641 has 64 divisors (see below), whose sum is σ = 1138924800. Its totient is φ = 404103168.

The previous prime is 684781639. The next prime is 684781649. The reversal of 684781641 is 146187486.

It is not a de Polignac number, because 684781641 - 2¹ = 684781639 is a prime.

It is a super-3 number, since 3×684781641³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (684781649) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2031825 + ... + 2032161.

It is an arithmetic number, because the mean of its divisors is an integer number (17795700).

Almost surely, 2^684781641 is an apocalyptic number.

It is an amenable number.

684781641 is a deficient number, since it is larger than the sum of its proper divisors (454143159).

684781641 is a wasteful number, since it uses less digits than its factorization.

684781641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615 (or 609 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 684781641 is about 26168.3327898435. The cubic root of 684781641 is about 881.4223043799.

It can be divided in two parts, 6847 and 81641, that added together give a palindrome (88488).

The spelling of 684781641 in words is "six hundred eighty-four million, seven hundred eighty-one thousand, six hundred forty-one".