84352778 has 4 divisors (see below), whose sum is σ = 126529170. Its totient is φ = 42176388.

The previous prime is 84352747. The next prime is 84352781. The reversal of 84352778 is 87725348.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 84143929 + 208849 = 9173^2 + 457^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21088193 + ... + 21088196.

Almost surely, 2^84352778 is an apocalyptic number.

84352778 is a deficient number, since it is larger than the sum of its proper divisors (42176392).

84352778 is a wasteful number, since it uses less digits than its factorization.

84352778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42176391.

The product of its digits is 376320, while the sum is 44.

The square root of 84352778 is about 9184.3768433139. The cubic root of 84352778 is about 438.5641521527.

The spelling of 84352778 in words is "eighty-four million, three hundred fifty-two thousand, seven hundred seventy-eight".