81602154 has 20 divisors (see below), whose sum is σ = 182849634. Its totient is φ = 27200664.

The previous prime is 81602153. The next prime is 81602161. The reversal of 81602154 is 45120618.

81602154 is a `hidden beast` number, since 8 + 1 + 602 + 1 + 54 = 666.

It can be written as a sum of positive squares in only one way, i.e., 73564929 + 8037225 = 8577^2 + 2835^2 .

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

It is not an unprimeable number, because it can be changed into a prime (81602153) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 251697 + ... + 252020.

Almost surely, 2^81602154 is an apocalyptic number.

81602154 is an abundant number, since it is smaller than the sum of its proper divisors (101247480).

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

81602154 is a wasteful number, since it uses less digits than its factorization.

81602154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503731 (or 503722 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 81602154 is about 9033.3910576261. The cubic root of 81602154 is about 433.7443935083.

The spelling of 81602154 in words is "eighty-one million, six hundred two thousand, one hundred fifty-four".