81620000770 has 32 divisors (see below), whose sum is σ = 183168003456. Its totient is φ = 25440000000.

The previous prime is 81620000741. The next prime is 81620000797. The reversal of 81620000770 is 7700002618.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52999231 + ... + 53000770.

It is an arithmetic number, because the mean of its divisors is an integer number (5724000108).

Almost surely, 2^81620000770 is an apocalyptic number.

81620000770 is an abundant number, since it is smaller than the sum of its proper divisors (101548002686).

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

81620000770 is a wasteful number, since it uses less digits than its factorization.

81620000770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106000026.

The product of its (nonzero) digits is 4704, while the sum is 31.

The spelling of 81620000770 in words is "eighty-one billion, six hundred twenty million, seven hundred seventy", and thus it is an aban number.