6978528937 has 4 divisors (see below), whose sum is σ = 6999237076. Its totient is φ = 6957820800.

The previous prime is 6978528919. The next prime is 6978528971. The reversal of 6978528937 is 7398258796.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5141463616 + 1837065321 = 71704^2 + 42861^2 .

It is a cyclic number.

It is not a de Polignac number, because 6978528937 - 2¹⁵ = 6978496169 is a prime.

It is a super-2 number, since 2×6978528937² = 97399732249092699938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6978528737) 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, 10353564 + ... + 10354237.

It is an arithmetic number, because the mean of its divisors is an integer number (1749809269).

Almost surely, 2^6978528937 is an apocalyptic number.

It is an amenable number.

6978528937 is a deficient number, since it is larger than the sum of its proper divisors (20708139).

6978528937 is a wasteful number, since it uses less digits than its factorization.

6978528937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20708138.

The product of its digits is 45722880, while the sum is 64.

The square root of 6978528937 is about 83537.5899640395. The cubic root of 6978528937 is about 1910.9733384087.

The spelling of 6978528937 in words is "six billion, nine hundred seventy-eight million, five hundred twenty-eight thousand, nine hundred thirty-seven".