3691478640 has 80 divisors (see below), whose sum is σ = 11463516288. Its totient is φ = 982679808.

The previous prime is 3691478629. The next prime is 3691478683. The reversal of 3691478640 is 468741963.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 3691478640.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127779 + ... + 153981.

Almost surely, 2^3691478640 is an apocalyptic number.

3691478640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3691478640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5731758144).

3691478640 is an abundant number, since it is smaller than the sum of its proper divisors (7772037648).

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

3691478640 is a wasteful number, since it uses less digits than its factorization.

3691478640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26806 (or 26800 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 48.

The square root of 3691478640 is about 60757.5397790266. The cubic root of 3691478640 is about 1545.4920898754.

The spelling of 3691478640 in words is "three billion, six hundred ninety-one million, four hundred seventy-eight thousand, six hundred forty".