7637634981 has 6 divisors (see below), whose sum is σ = 11032139430. Its totient is φ = 5091756648.

The previous prime is 7637634971. The next prime is 7637634997. The reversal of 7637634981 is 1894367367.

It can be written as a sum of positive squares in only one way, i.e., 5356044225 + 2281590756 = 73185^2 + 47766^2 .

It is not a de Polignac number, because 7637634981 - 2¹⁵ = 7637602213 is a prime.

It is a super-2 number, since 2×7637634981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7637634911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 424313046 + ... + 424313063.

It is an arithmetic number, because the mean of its divisors is an integer number (1838689905).

Almost surely, 2^7637634981 is an apocalyptic number.

It is an amenable number.

7637634981 is a deficient number, since it is larger than the sum of its proper divisors (3394504449).

7637634981 is a wasteful number, since it uses less digits than its factorization.

7637634981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848626115 (or 848626112 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 54.

The square root of 7637634981 is about 87393.5637275423. The cubic root of 7637634981 is about 1969.3351515486.

The spelling of 7637634981 in words is "seven billion, six hundred thirty-seven million, six hundred thirty-four thousand, nine hundred eighty-one".