83781408 has 48 divisors (see below), whose sum is σ = 220401216. Its totient is φ = 27866880.

The previous prime is 83781407. The next prime is 83781413. The reversal of 83781408 is 80418738.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (83781407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78285 + ... + 79347.

It is an arithmetic number, because the mean of its divisors is an integer number (4591692).

Almost surely, 2^83781408 is an apocalyptic number.

It is an amenable number.

83781408 is an abundant number, since it is smaller than the sum of its proper divisors (136619808).

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

83781408 is a wasteful number, since it uses less digits than its factorization.

83781408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1897 (or 1889 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 83781408 is about 9153.2184503594. The cubic root of 83781408 is about 437.5716919793.

The spelling of 83781408 in words is "eighty-three million, seven hundred eighty-one thousand, four hundred eight".