70875991 has 4 divisors (see below), whose sum is σ = 71393472. Its totient is φ = 70358512.

The previous prime is 70875989. The next prime is 70876021. The reversal of 70875991 is 19957807.

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

It is a cyclic number.

It is not a de Polignac number, because 70875991 - 2¹ = 70875989 is a prime.

It is a super-2 number, since 2×70875991² = 10046812200464162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70875901) 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, 258535 + ... + 258808.

It is an arithmetic number, because the mean of its divisors is an integer number (17848368).

Almost surely, 2^70875991 is an apocalyptic number.

70875991 is a deficient number, since it is larger than the sum of its proper divisors (517481).

70875991 is a wasteful number, since it uses less digits than its factorization.

70875991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517480.

The product of its (nonzero) digits is 158760, while the sum is 46.

The square root of 70875991 is about 8418.7879769002. The cubic root of 70875991 is about 413.8405552622.

The spelling of 70875991 in words is "seventy million, eight hundred seventy-five thousand, nine hundred ninety-one".