81620102 has 8 divisors (see below), whose sum is σ = 122629800. Its totient is φ = 40743504.

The previous prime is 81620101. The next prime is 81620107. The reversal of 81620102 is 20102618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81620101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31727 + ... + 34202.

It is an arithmetic number, because the mean of its divisors is an integer number (15328725).

Almost surely, 2^81620102 is an apocalyptic number.

81620102 is a deficient number, since it is larger than the sum of its proper divisors (41009698).

81620102 is a wasteful number, since it uses less digits than its factorization.

81620102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66550.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 81620102 is about 9034.3844283936. The cubic root of 81620102 is about 433.7761911726.

It can be divided in two parts, 81620 and 102, that multiplied together give a triangular number (8325240 = T₄₀₈₀).

The spelling of 81620102 in words is "eighty-one million, six hundred twenty thousand, one hundred two".