78215027 has 4 divisors (see below), whose sum is σ = 85325496. Its totient is φ = 71104560.

The previous prime is 78215023. The next prime is 78215029. The reversal of 78215027 is 72051287.

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 78215027 - 2² = 78215023 is a prime.

It is a super-2 number, since 2×78215027² = 12235180897221458, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78214984 and 78215002.

It is not an unprimeable number, because it can be changed into a prime (78215023) 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, 3555218 + ... + 3555239.

It is an arithmetic number, because the mean of its divisors is an integer number (21331374).

Almost surely, 2^78215027 is an apocalyptic number.

78215027 is a deficient number, since it is larger than the sum of its proper divisors (7110469).

78215027 is a wasteful number, since it uses less digits than its factorization.

78215027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7110468.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 78215027 is about 8843.9259947152. The cubic root of 78215027 is about 427.6581305733.

The spelling of 78215027 in words is "seventy-eight million, two hundred fifteen thousand, twenty-seven".