81574160 has 40 divisors (see below), whose sum is σ = 200819736. Its totient is φ = 30709760.

The previous prime is 81574153. The next prime is 81574219. The reversal of 81574160 is 6147518.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6370576 + 75203584 = 2524^2 + 8672^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28631 + ... + 31350.

Almost surely, 2^81574160 is an apocalyptic number.

81574160 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81574160 is an abundant number, since it is smaller than the sum of its proper divisors (119245576).

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

81574160 is a wasteful number, since it uses less digits than its factorization.

81574160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60011 (or 60005 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 81574160 is about 9031.8414512213. The cubic root of 81574160 is about 433.6947884889.

The spelling of 81574160 in words is "eighty-one million, five hundred seventy-four thousand, one hundred sixty".