84640604649 has 16 divisors (see below), whose sum is σ = 119559096000. Its totient is φ = 53078284800.

The previous prime is 84640604617. The next prime is 84640604677. The reversal of 84640604649 is 94640604648.

It is not a de Polignac number, because 84640604649 - 2⁵ = 84640604617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (84640602649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 368899 + ... + 552600.

It is an arithmetic number, because the mean of its divisors is an integer number (7472443500).

Almost surely, 2^84640604649 is an apocalyptic number.

It is an amenable number.

84640604649 is a deficient number, since it is larger than the sum of its proper divisors (34918491351).

84640604649 is a wasteful number, since it uses less digits than its factorization.

84640604649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923320.

The product of its (nonzero) digits is 3981312, while the sum is 51.

Subtracting 84640604649 from its reverse (94640604648), we obtain a palindrome (9999999999).

The spelling of 84640604649 in words is "eighty-four billion, six hundred forty million, six hundred four thousand, six hundred forty-nine".