7691431680 has 144 divisors (see below), whose sum is σ = 27294022560. Its totient is φ = 2051039232.

The previous prime is 7691431651. The next prime is 7691431687. The reversal of 7691431680 is 861341967.

It is a happy number.

7691431680 is a `hidden beast` number, since 76 + 91 + 431 + 68 + 0 = 666.

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 (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7691431687) 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, 76717 + ... + 145836.

Almost surely, 2^7691431680 is an apocalyptic number.

It is an amenable number.

7691431680 is an abundant number, since it is smaller than the sum of its proper divisors (19602590880).

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

7691431680 is a wasteful number, since it uses less digits than its factorization.

7691431680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222583 (or 222563 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 7691431680 is about 87700.8077499860. The cubic root of 7691431680 is about 1973.9480959366.

The spelling of 7691431680 in words is "seven billion, six hundred ninety-one million, four hundred thirty-one thousand, six hundred eighty".