84513978 has 12 divisors (see below), whose sum is σ = 183113658. Its totient is φ = 28171320.

The previous prime is 84513973. The next prime is 84514009. The reversal of 84513978 is 87931548.

It can be written as a sum of positive squares in only one way, i.e., 61732449 + 22781529 = 7857^2 + 4773^2 .

It is a super-3 number, since 3×84513978³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (84513973) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2347593 + ... + 2347628.

Almost surely, 2^84513978 is an apocalyptic number.

84513978 is an abundant number, since it is smaller than the sum of its proper divisors (98599680).

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

84513978 is a wasteful number, since it uses less digits than its factorization.

84513978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4695229 (or 4695226 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 84513978 is about 9193.1484269536. The cubic root of 84513978 is about 438.8433429375.

It can be divided in two parts, 84513 and 978, that added together give a triangular number (85491 = T₄₁₃).

The spelling of 84513978 in words is "eighty-four million, five hundred thirteen thousand, nine hundred seventy-eight".