81622080 has 280 divisors, whose sum is σ = 300947328. Its totient is φ = 20984832.

The previous prime is 81622063. The next prime is 81622109. The reversal of 81622080 is 8022618.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1218207 + ... + 1218273.

Almost surely, 2^81622080 is an apocalyptic number.

81622080 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81622080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150473664).

81622080 is an abundant number, since it is smaller than the sum of its proper divisors (219325248).

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

81622080 is a wasteful number, since it uses less digits than its factorization.

81622080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 81622080 is about 9034.4938983874. The cubic root of 81622080 is about 433.7796952211.

Adding to 81622080 its reverse (8022618), we get a palindrome (89644698).

The spelling of 81622080 in words is "eighty-one million, six hundred twenty-two thousand, eighty".