78121027 has 4 divisors (see below), whose sum is σ = 82232680. Its totient is φ = 74009376.

The previous prime is 78121013. The next prime is 78121039. The reversal of 78121027 is 72012187.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78121027 is a prime.

It is a super-2 number, since 2×78121027² = 12205789719069458, 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 = 78120986 and 78121004.

It is not an unprimeable number, because it can be changed into a prime (78121007) 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, 2055798 + ... + 2055835.

It is an arithmetic number, because the mean of its divisors is an integer number (20558170).

Almost surely, 2^78121027 is an apocalyptic number.

78121027 is a deficient number, since it is larger than the sum of its proper divisors (4111653).

78121027 is a wasteful number, since it uses less digits than its factorization.

78121027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4111652.

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 78121027 is about 8838.6100151551. The cubic root of 78121027 is about 427.4867398963.

The spelling of 78121027 in words is "seventy-eight million, one hundred twenty-one thousand, twenty-seven".