81554064 has 20 divisors (see below), whose sum is σ = 210681456. Its totient is φ = 27184672.

The previous prime is 81554059. The next prime is 81554069. The reversal of 81554064 is 46045518.

It is an interprime number because it is at equal distance from previous prime (81554059) and next prime (81554069).

It is not an unprimeable number, because it can be changed into a prime (81554069) 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, 849474 + ... + 849569.

Almost surely, 2^81554064 is an apocalyptic number.

It is an amenable number.

81554064 is an abundant number, since it is smaller than the sum of its proper divisors (129127392).

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

81554064 is a wasteful number, since it uses less digits than its factorization.

81554064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1699054 (or 1699048 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 81554064 is about 9030.7288742382. The cubic root of 81554064 is about 433.6591716291.

The spelling of 81554064 in words is "eighty-one million, five hundred fifty-four thousand, sixty-four".