81877070 has 48 divisors (see below), whose sum is σ = 163404864. Its totient is φ = 29515200.

The previous prime is 81877043. The next prime is 81877087. The reversal of 81877070 is 7077818.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 189755 + ... + 190185.

It is an arithmetic number, because the mean of its divisors is an integer number (3404268).

Almost surely, 2^81877070 is an apocalyptic number.

81877070 is a deficient number, since it is larger than the sum of its proper divisors (81527794).

81877070 is a wasteful number, since it uses less digits than its factorization.

81877070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617 (or 606 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 38.

The square root of 81877070 is about 9048.5949185495. The cubic root of 81877070 is about 434.2309395471.

The spelling of 81877070 in words is "eighty-one million, eight hundred seventy-seven thousand, seventy".