78378359 has 4 divisors (see below), whose sum is σ = 78405720. Its totient is φ = 78351000.

The previous prime is 78378353. The next prime is 78378397. The reversal of 78378359 is 95387387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95387387 = 811 ⋅117617.

It is a cyclic number.

It is not a de Polignac number, because 78378359 - 2⁴ = 78378343 is a prime.

It is a super-2 number, since 2×78378359² = 12286334319065762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78378353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8804 + ... + 15305.

It is an arithmetic number, because the mean of its divisors is an integer number (19601430).

Almost surely, 2^78378359 is an apocalyptic number.

78378359 is a deficient number, since it is larger than the sum of its proper divisors (27361).

78378359 is a wasteful number, since it uses less digits than its factorization.

78378359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27360.

The product of its digits is 1270080, while the sum is 50.

The square root of 78378359 is about 8853.1553132203. The cubic root of 78378359 is about 427.9556083315.

Subtracting 78378359 from its reverse (95387387), we obtain a triangular number (17009028 = T₅₈₃₂).

The spelling of 78378359 in words is "seventy-eight million, three hundred seventy-eight thousand, three hundred fifty-nine".