78405356 has 12 divisors (see below), whose sum is σ = 137538240. Its totient is φ = 39108720.

The previous prime is 78405347. The next prime is 78405361. The reversal of 78405356 is 65350487.

It is a super-2 number, since 2×78405356² = 12294799698973472, which contains 22 as substring.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21596 + ... + 24963.

It is an arithmetic number, because the mean of its divisors is an integer number (11461520).

Almost surely, 2^78405356 is an apocalyptic number.

It is an amenable number.

78405356 is a deficient number, since it is larger than the sum of its proper divisors (59132884).

78405356 is a wasteful number, since it uses less digits than its factorization.

78405356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46984 (or 46982 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 38.

The square root of 78405356 is about 8854.6798925766. The cubic root of 78405356 is about 428.0047383526.

The spelling of 78405356 in words is "seventy-eight million, four hundred five thousand, three hundred fifty-six".