78366451 has 8 divisors (see below), whose sum is σ = 81870624. Its totient is φ = 74870400.

The previous prime is 78366443. The next prime is 78366461. The reversal of 78366451 is 15466387.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78366451 - 2³ = 78366443 is a prime.

It is a super-2 number, since 2×78366451² = 12282601284670802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78366461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26205 + ... + 29041.

It is an arithmetic number, because the mean of its divisors is an integer number (10233828).

Almost surely, 2^78366451 is an apocalyptic number.

78366451 is a deficient number, since it is larger than the sum of its proper divisors (3504173).

78366451 is a wasteful number, since it uses less digits than its factorization.

78366451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4061.

The product of its digits is 120960, while the sum is 40.

The square root of 78366451 is about 8852.4827590908. The cubic root of 78366451 is about 427.9339341792.

The spelling of 78366451 in words is "seventy-eight million, three hundred sixty-six thousand, four hundred fifty-one".