84978845 has 24 divisors (see below), whose sum is σ = 120741504. Its totient is φ = 56242368.

The previous prime is 84978841. The next prime is 84978853. The reversal of 84978845 is 54887948.

It is a happy number.

It is not a de Polignac number, because 84978845 - 2² = 84978841 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84978841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27992 + ... + 30878.

It is an arithmetic number, because the mean of its divisors is an integer number (5030896).

Almost surely, 2^84978845 is an apocalyptic number.

It is an amenable number.

84978845 is a deficient number, since it is larger than the sum of its proper divisors (35762659).

84978845 is a wasteful number, since it uses less digits than its factorization.

84978845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2957 (or 2928 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 53.

The square root of 84978845 is about 9218.3970949401. The cubic root of 84978845 is about 439.6464877455.

The spelling of 84978845 in words is "eighty-four million, nine hundred seventy-eight thousand, eight hundred forty-five".