78369401 has 12 divisors (see below), whose sum is σ = 86618112. Its totient is φ = 70851000.

The previous prime is 78369391. The next prime is 78369407. The reversal of 78369401 is 10496387.

It is not a de Polignac number, because 78369401 - 2¹⁰ = 78368377 is a prime.

It is a super-2 number, since 2×78369401² = 12283526026197602, 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 (78369407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21416 + ... + 24806.

It is an arithmetic number, because the mean of its divisors is an integer number (7218176).

Almost surely, 2^78369401 is an apocalyptic number.

It is an amenable number.

78369401 is a deficient number, since it is larger than the sum of its proper divisors (8248711).

78369401 is a wasteful number, since it uses less digits than its factorization.

78369401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3604 (or 3593 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 78369401 is about 8852.6493774463. The cubic root of 78369401 is about 427.9393037782.

The spelling of 78369401 in words is "seventy-eight million, three hundred sixty-nine thousand, four hundred one".