81952070 has 16 divisors (see below), whose sum is σ = 156191328. Its totient is φ = 30852480.

The previous prime is 81952069. The next prime is 81952139. The reversal of 81952070 is 7025918.

It is a super-2 number, since 2×81952070² = 13432283554569800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240866 + ... + 241205.

It is an arithmetic number, because the mean of its divisors is an integer number (9761958).

Almost surely, 2^81952070 is an apocalyptic number.

81952070 is a deficient number, since it is larger than the sum of its proper divisors (74239258).

81952070 is a wasteful number, since it uses less digits than its factorization.

81952070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482095.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 81952070 is about 9052.7382597753. The cubic root of 81952070 is about 434.3634853322.

Adding to 81952070 its reverse (7025918), we get a palindrome (88977988).

The spelling of 81952070 in words is "eighty-one million, nine hundred fifty-two thousand, seventy".