84778783 has 4 divisors (see below), whose sum is σ = 85556680. Its totient is φ = 84000888.

The previous prime is 84778781. The next prime is 84778787. The reversal of 84778783 is 38787748.

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

It is a cyclic number.

It is not a de Polignac number, because 84778783 - 2¹ = 84778781 is a prime.

It is a super-2 number, since 2×84778783² = 14374884093922178, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 84778783.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84778781) 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, 388785 + ... + 389002.

It is an arithmetic number, because the mean of its divisors is an integer number (21389170).

Almost surely, 2^84778783 is an apocalyptic number.

84778783 is a deficient number, since it is larger than the sum of its proper divisors (777897).

84778783 is a wasteful number, since it uses less digits than its factorization.

84778783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777896.

The product of its digits is 2107392, while the sum is 52.

The square root of 84778783 is about 9207.5394650254. The cubic root of 84778783 is about 439.3012031038.

The spelling of 84778783 in words is "eighty-four million, seven hundred seventy-eight thousand, seven hundred eighty-three".