81948670 has 16 divisors (see below), whose sum is σ = 156184848. Its totient is φ = 30851200.

The previous prime is 81948641. The next prime is 81948677. The reversal of 81948670 is 7684918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81948677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240856 + ... + 241195.

It is an arithmetic number, because the mean of its divisors is an integer number (9761553).

Almost surely, 2^81948670 is an apocalyptic number.

81948670 is a deficient number, since it is larger than the sum of its proper divisors (74236178).

81948670 is a wasteful number, since it uses less digits than its factorization.

81948670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482075.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 81948670 is about 9052.5504693429. The cubic root of 81948670 is about 434.3574783402.

The spelling of 81948670 in words is "eighty-one million, nine hundred forty-eight thousand, six hundred seventy".