6901604640 has 144 divisors (see below), whose sum is σ = 26916297408. Its totient is φ = 1577507328.

The previous prime is 6901604627. The next prime is 6901604653. The reversal of 6901604640 is 464061096.

6901604640 is a `hidden beast` number, since 6 + 9 + 0 + 1 + 6 + 0 + 4 + 640 = 666.

It is an interprime number because it is at equal distance from previous prime (6901604627) and next prime (6901604653).

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 6901604595 and 6901604604.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 332262 + ... + 352421.

It is an arithmetic number, because the mean of its divisors is an integer number (186918732).

Almost surely, 2^6901604640 is an apocalyptic number.

6901604640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6901604640 is an abundant number, since it is smaller than the sum of its proper divisors (20014692768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6901604640 is a wasteful number, since it uses less digits than its factorization.

6901604640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684711 (or 684700 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 6901604640 is about 83075.8968654567. The cubic root of 6901604640 is about 1903.9258292082.

The spelling of 6901604640 in words is "six billion, nine hundred one million, six hundred four thousand, six hundred forty".