81677088 has 36 divisors (see below), whose sum is σ = 232270038. Its totient is φ = 27225600.

The previous prime is 81677083. The next prime is 81677107. The reversal of 81677088 is 88077618.

It can be written as a sum of positive squares in only one way, i.e., 55175184 + 26501904 = 7428^2 + 5148^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×81677088² = 13342293408319488, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81677083) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 141513 + ... + 142088.

Almost surely, 2^81677088 is an apocalyptic number.

It is an amenable number.

81677088 is an abundant number, since it is smaller than the sum of its proper divisors (150592950).

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

81677088 is a wasteful number, since it uses less digits than its factorization.

81677088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283617 (or 283606 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 45.

The square root of 81677088 is about 9037.5377177636. The cubic root of 81677088 is about 433.8771198197.

The spelling of 81677088 in words is "eighty-one million, six hundred seventy-seven thousand, eighty-eight".