70998561 has 6 divisors (see below), whose sum is σ = 102553490. Its totient is φ = 47332368.

The previous prime is 70998553. The next prime is 70998607. The reversal of 70998561 is 16589907.

It can be written as a sum of positive squares in only one way, i.e., 63297936 + 7700625 = 7956^2 + 2775^2 .

It is not a de Polignac number, because 70998561 - 2³ = 70998553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70998541) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3944356 + ... + 3944373.

Almost surely, 2^70998561 is an apocalyptic number.

It is an amenable number.

70998561 is a deficient number, since it is larger than the sum of its proper divisors (31554929).

70998561 is a wasteful number, since it uses less digits than its factorization.

70998561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7888735 (or 7888732 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 70998561 is about 8426.0643838034. The cubic root of 70998561 is about 414.0789774413.

The spelling of 70998561 in words is "seventy million, nine hundred ninety-eight thousand, five hundred sixty-one".