70881887 has 4 divisors (see below), whose sum is σ = 73326120. Its totient is φ = 68437656.

The previous prime is 70881869. The next prime is 70881911. The reversal of 70881887 is 78818807.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78818807 = 449 ⋅175543.

It is a cyclic number.

It is not a de Polignac number, because 70881887 - 2⁸ = 70881631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70881847) 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, 1222073 + ... + 1222130.

It is an arithmetic number, because the mean of its divisors is an integer number (18331530).

Almost surely, 2^70881887 is an apocalyptic number.

70881887 is a deficient number, since it is larger than the sum of its proper divisors (2444233).

70881887 is a wasteful number, since it uses less digits than its factorization.

70881887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2444232.

The product of its (nonzero) digits is 200704, while the sum is 47.

The square root of 70881887 is about 8419.1381387883. The cubic root of 70881887 is about 413.8520304045.

The spelling of 70881887 in words is "seventy million, eight hundred eighty-one thousand, eight hundred eighty-seven".