7637719921 has 24 divisors (see below), whose sum is σ = 8816208000. Its totient is φ = 6594374592.

The previous prime is 7637719909. The next prime is 7637719939. The reversal of 7637719921 is 1299177367.

It is not a de Polignac number, because 7637719921 - 2⁹ = 7637719409 is a prime.

It is a super-4 number, since 4×7637719921⁴ (a number of 41 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7637719951) 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, 238615 + ... + 268723.

It is an arithmetic number, because the mean of its divisors is an integer number (367342000).

Almost surely, 2^7637719921 is an apocalyptic number.

It is an amenable number.

7637719921 is a deficient number, since it is larger than the sum of its proper divisors (1178488079).

7637719921 is a wasteful number, since it uses less digits than its factorization.

7637719921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30233 (or 30220 counting only the distinct ones).

The product of its digits is 1000188, while the sum is 52.

The square root of 7637719921 is about 87394.0496887517. The cubic root of 7637719921 is about 1969.3424520070.

The spelling of 7637719921 in words is "seven billion, six hundred thirty-seven million, seven hundred nineteen thousand, nine hundred twenty-one".