81294464 has 32 divisors (see below), whose sum is σ = 170482800. Its totient is φ = 38506752.

The previous prime is 81294463. The next prime is 81294481. The reversal of 81294464 is 46449218.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (38).

It is not an unprimeable number, because it can be changed into a prime (81294463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14282 + ... + 19145.

Almost surely, 2^81294464 is an apocalyptic number.

It is an amenable number.

81294464 is an abundant number, since it is smaller than the sum of its proper divisors (89188336).

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

81294464 is a wasteful number, since it uses less digits than its factorization.

81294464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33460 (or 33448 counting only the distinct ones).

The product of its digits is 55296, while the sum is 38.

The square root of 81294464 is about 9016.3442702683. The cubic root of 81294464 is about 433.1985463765.

The spelling of 81294464 in words is "eighty-one million, two hundred ninety-four thousand, four hundred sixty-four".