6904649421 has 24 divisors (see below), whose sum is σ = 10059075000. Its totient is φ = 4563666432.

The previous prime is 6904649383. The next prime is 6904649429. The reversal of 6904649421 is 1249464096.

It can be written as a sum of positive squares in 4 ways, for example, as 201952521 + 6702696900 = 14211^2 + 81870^2 .

It is not a de Polignac number, because 6904649421 - 2¹³ = 6904641229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6904649429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 758505 + ... + 767553.

It is an arithmetic number, because the mean of its divisors is an integer number (419128125).

Almost surely, 2^6904649421 is an apocalyptic number.

It is an amenable number.

6904649421 is a deficient number, since it is larger than the sum of its proper divisors (3154425579).

6904649421 is a wasteful number, since it uses less digits than its factorization.

6904649421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9773 (or 9770 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The square root of 6904649421 is about 83094.2201419569. The cubic root of 6904649421 is about 1904.2057730381.

The spelling of 6904649421 in words is "six billion, nine hundred four million, six hundred forty-nine thousand, four hundred twenty-one".