83621378 has 16 divisors (see below), whose sum is σ = 126628920. Its totient is φ = 41414016.

The previous prime is 83621371. The next prime is 83621383. The reversal of 83621378 is 87312638.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 79156609 + 4464769 = 8897^2 + 2113^2 .

It is not an unprimeable number, because it can be changed into a prime (83621371) 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, 146678 + ... + 147246.

Almost surely, 2^83621378 is an apocalyptic number.

83621378 is a deficient number, since it is larger than the sum of its proper divisors (43007542).

83621378 is a wasteful number, since it uses less digits than its factorization.

83621378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1141.

The product of its digits is 48384, while the sum is 38.

The square root of 83621378 is about 9144.4725380964. The cubic root of 83621378 is about 437.2929140207.

The spelling of 83621378 in words is "eighty-three million, six hundred twenty-one thousand, three hundred seventy-eight".