78381351 has 28 divisors (see below), whose sum is σ = 119093280. Its totient is φ = 51554880.

The previous prime is 78381337. The next prime is 78381367. The reversal of 78381351 is 15318387.

It is not a de Polignac number, because 78381351 - 2¹⁰ = 78380327 is a prime.

It is a super-2 number, since 2×78381351² = 12287272369170402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78381451) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 56911 + ... + 58271.

Almost surely, 2^78381351 is an apocalyptic number.

78381351 is a deficient number, since it is larger than the sum of its proper divisors (40711929).

78381351 is an equidigital number, since it uses as much as digits as its factorization.

78381351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458 (or 1443 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 78381351 is about 8853.3242909090. The cubic root of 78381351 is about 427.9610538265.

The spelling of 78381351 in words is "seventy-eight million, three hundred eighty-one thousand, three hundred fifty-one".