78450415 has 4 divisors (see below), whose sum is σ = 94140504. Its totient is φ = 62760328.

The previous prime is 78450413. The next prime is 78450419. The reversal of 78450415 is 51405487.

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 78450415 - 2¹ = 78450413 is a prime.

It is a super-2 number, since 2×78450415² = 12308935227344450, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78450413) 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, 7845037 + ... + 7845046.

It is an arithmetic number, because the mean of its divisors is an integer number (23535126).

Almost surely, 2^78450415 is an apocalyptic number.

78450415 is a deficient number, since it is larger than the sum of its proper divisors (15690089).

78450415 is a wasteful number, since it uses less digits than its factorization.

78450415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15690088.

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 78450415 is about 8857.2238878782. The cubic root of 78450415 is about 428.0867130767.

The spelling of 78450415 in words is "seventy-eight million, four hundred fifty thousand, four hundred fifteen".