7988649477 has 4 divisors (see below), whose sum is σ = 10651532640. Its totient is φ = 5325766316.

The previous prime is 7988649463. The next prime is 7988649481. The reversal of 7988649477 is 7749468897.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7988649477 - 2¹² = 7988645381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7988649407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1331441577 + ... + 1331441582.

It is an arithmetic number, because the mean of its divisors is an integer number (2662883160).

Almost surely, 2^7988649477 is an apocalyptic number.

It is an amenable number.

7988649477 is a deficient number, since it is larger than the sum of its proper divisors (2662883163).

7988649477 is a wasteful number, since it uses less digits than its factorization.

7988649477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2662883162.

The product of its digits is 170698752, while the sum is 69.

The square root of 7988649477 is about 89379.2452250521. The cubic root of 7988649477 is about 1999.0536753888.

The spelling of 7988649477 in words is "seven billion, nine hundred eighty-eight million, six hundred forty-nine thousand, four hundred seventy-seven".