70881639 has 4 divisors (see below), whose sum is σ = 94508856. Its totient is φ = 47254424.

The previous prime is 70881637. The next prime is 70881641. The reversal of 70881639 is 93618807.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93618807 = 3 ⋅31206269.

It is an interprime number because it is at equal distance from previous prime (70881637) and next prime (70881641).

It is a cyclic number.

It is not a de Polignac number, because 70881639 - 2¹ = 70881637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 70881639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70881631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11813604 + ... + 11813609.

It is an arithmetic number, because the mean of its divisors is an integer number (23627214).

Almost surely, 2^70881639 is an apocalyptic number.

70881639 is a deficient number, since it is larger than the sum of its proper divisors (23627217).

70881639 is a wasteful number, since it uses less digits than its factorization.

70881639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23627216.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 70881639 is about 8419.1234104270. The cubic root of 70881639 is about 413.8515477452.

The spelling of 70881639 in words is "seventy million, eight hundred eighty-one thousand, six hundred thirty-nine".