78285384 has 48 divisors (see below), whose sum is σ = 219339900. Its totient is φ = 25194624.

The previous prime is 78285367. The next prime is 78285401. The reversal of 78285384 is 48358287.

It is an interprime number because it is at equal distance from previous prime (78285367) and next prime (78285401).

It can be written as a sum of positive squares in 2 ways, for example, as 77053284 + 1232100 = 8778^2 + 1110^2 .

It is a super-2 number, since 2×78285384² = 12257202696054912, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16659 + ... + 20834.

Almost surely, 2^78285384 is an apocalyptic number.

It is an amenable number.

78285384 is an abundant number, since it is smaller than the sum of its proper divisors (141054516).

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

78285384 is a wasteful number, since it uses less digits than its factorization.

78285384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37534 (or 37527 counting only the distinct ones).

The product of its digits is 430080, while the sum is 45.

The square root of 78285384 is about 8847.9028023594. The cubic root of 78285384 is about 427.7863230141.

The spelling of 78285384 in words is "seventy-eight million, two hundred eighty-five thousand, three hundred eighty-four".