78215411 has 4 divisors (see below), whose sum is σ = 78513072. Its totient is φ = 77917752.

The previous prime is 78215393. The next prime is 78215429. The reversal of 78215411 is 11451287.

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

It is an interprime number because it is at equal distance from previous prime (78215393) and next prime (78215429).

It is a cyclic number.

It is not a de Polignac number, because 78215411 - 2¹⁴ = 78199027 is a prime.

It is a super-2 number, since 2×78215411² = 12235301035797842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78215441) 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, 148436 + ... + 148961.

It is an arithmetic number, because the mean of its divisors is an integer number (19628268).

Almost surely, 2^78215411 is an apocalyptic number.

78215411 is a deficient number, since it is larger than the sum of its proper divisors (297661).

78215411 is a wasteful number, since it uses less digits than its factorization.

78215411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297660.

The product of its digits is 2240, while the sum is 29.

The square root of 78215411 is about 8843.9477045039. The cubic root of 78215411 is about 427.6588304408.

Adding to 78215411 its reverse (11451287), we get a palindrome (89666698).

The spelling of 78215411 in words is "seventy-eight million, two hundred fifteen thousand, four hundred eleven".