84124778 has 4 divisors (see below), whose sum is σ = 126187170. Its totient is φ = 42062388.

The previous prime is 84124769. The next prime is 84124787. The reversal of 84124778 is 87742148.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (84124769) and next prime (84124787).

It can be written as a sum of positive squares in only one way, i.e., 83302129 + 822649 = 9127^2 + 907^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21031193 + ... + 21031196.

Almost surely, 2^84124778 is an apocalyptic number.

84124778 is a deficient number, since it is larger than the sum of its proper divisors (42062392).

84124778 is a wasteful number, since it uses less digits than its factorization.

84124778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42062391.

The product of its digits is 100352, while the sum is 41.

The square root of 84124778 is about 9171.9560618224. The cubic root of 84124778 is about 438.1686589405.

The spelling of 84124778 in words is "eighty-four million, one hundred twenty-four thousand, seven hundred seventy-eight".