78378403 has 4 divisors (see below), whose sum is σ = 78503248. Its totient is φ = 78253560.

The previous prime is 78378397. The next prime is 78378413. The reversal of 78378403 is 30487387.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78378403 - 2¹⁷ = 78247331 is a prime.

It is a super-2 number, since 2×78378403² = 12286348113660818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78378413) 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, 61476 + ... + 62737.

It is an arithmetic number, because the mean of its divisors is an integer number (19625812).

Almost surely, 2^78378403 is an apocalyptic number.

78378403 is a deficient number, since it is larger than the sum of its proper divisors (124845).

78378403 is a wasteful number, since it uses less digits than its factorization.

78378403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124844.

The product of its (nonzero) digits is 112896, while the sum is 40.

The square root of 78378403 is about 8853.1577982096. The cubic root of 78378403 is about 427.9556884133.

The spelling of 78378403 in words is "seventy-eight million, three hundred seventy-eight thousand, four hundred three".