78384986 has 16 divisors (see below), whose sum is σ = 120285000. Its totient is φ = 38296128.

The previous prime is 78384973. The next prime is 78385003. The reversal of 78384986 is 68948387.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 41357761 + 37027225 = 6431^2 + 6085^2 .

It is a super-2 number, since 2×78384986² = 12288412060440392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27140 + ... + 29888.

Almost surely, 2^78384986 is an apocalyptic number.

78384986 is a deficient number, since it is larger than the sum of its proper divisors (41900014).

78384986 is a wasteful number, since it uses less digits than its factorization.

78384986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3073.

The product of its digits is 2322432, while the sum is 53.

The square root of 78384986 is about 8853.5295786483. The cubic root of 78384986 is about 427.9676694069.

The spelling of 78384986 in words is "seventy-eight million, three hundred eighty-four thousand, nine hundred eighty-six".