81626370 has 32 divisors (see below), whose sum is σ = 223890048. Its totient is φ = 18657408.

The previous prime is 81626353. The next prime is 81626371. The reversal of 81626370 is 7362618.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81626371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194139 + ... + 194558.

It is an arithmetic number, because the mean of its divisors is an integer number (6996564).

Almost surely, 2^81626370 is an apocalyptic number.

81626370 is an abundant number, since it is smaller than the sum of its proper divisors (142263678).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81626370 is a wasteful number, since it uses less digits than its factorization.

81626370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388714.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 81626370 is about 9034.7313186392. The cubic root of 81626370 is about 433.7872948080.

Adding to 81626370 its reverse (7362618), we get a palindrome (88988988).

The spelling of 81626370 in words is "eighty-one million, six hundred twenty-six thousand, three hundred seventy".