81478602 has 32 divisors (see below), whose sum is σ = 186908160. Its totient is φ = 26282880.

The previous prime is 81478601. The next prime is 81478613. The reversal of 81478602 is 20687418.

81478602 is a `hidden beast` number, since 8 + 1 + 47 + 8 + 602 = 666.

It is not an unprimeable number, because it can be changed into a prime (81478601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22663 + ... + 26010.

It is an arithmetic number, because the mean of its divisors is an integer number (5840880).

Almost surely, 2^81478602 is an apocalyptic number.

81478602 is an abundant number, since it is smaller than the sum of its proper divisors (105429558).

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

81478602 is a wasteful number, since it uses less digits than its factorization.

81478602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48715 (or 48709 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 81478602 is about 9026.5498392243. The cubic root of 81478602 is about 433.5253753659.

The spelling of 81478602 in words is "eighty-one million, four hundred seventy-eight thousand, six hundred two".