81553416 has 32 divisors (see below), whose sum is σ = 233010240. Its totient is φ = 23300928.

The previous prime is 81553397. The next prime is 81553457. The reversal of 81553416 is 61435518.

It is a super-2 number, since 2×81553416² = 13301919322538112, which contains 22 as substring.

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, 242551 + ... + 242886.

It is an arithmetic number, because the mean of its divisors is an integer number (7281570).

Almost surely, 2^81553416 is an apocalyptic number.

It is an amenable number.

81553416 is an abundant number, since it is smaller than the sum of its proper divisors (151456824).

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

81553416 is a wasteful number, since it uses less digits than its factorization.

81553416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485453 (or 485449 counting only the distinct ones).

The product of its digits is 14400, while the sum is 33.

The square root of 81553416 is about 9030.6929966642. The cubic root of 81553416 is about 433.6580230581.

The spelling of 81553416 in words is "eighty-one million, five hundred fifty-three thousand, four hundred sixteen".