78380408 has 8 divisors (see below), whose sum is σ = 146963280. Its totient is φ = 39190200.

The previous prime is 78380399. The next prime is 78380429. The reversal of 78380408 is 80408387.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×78380408² = 12286976716492928, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4898768 + ... + 4898783.

It is an arithmetic number, because the mean of its divisors is an integer number (18370410).

Almost surely, 2^78380408 is an apocalyptic number.

It is an amenable number.

78380408 is a deficient number, since it is larger than the sum of its proper divisors (68582872).

78380408 is a wasteful number, since it uses less digits than its factorization.

78380408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9797557 (or 9797553 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 78380408 is about 8853.2710339174. The cubic root of 78380408 is about 427.9593375642.

The spelling of 78380408 in words is "seventy-eight million, three hundred eighty thousand, four hundred eight".