78212065 has 16 divisors (see below), whose sum is σ = 95797440. Its totient is φ = 61283520.

The previous prime is 78212041. The next prime is 78212107. The reversal of 78212065 is 56021287.

It is not a de Polignac number, because 78212065 - 2¹⁹ = 77687777 is a prime.

It is a super-2 number, since 2×78212065² = 12234254223128450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105466 + ... + 106204.

It is an arithmetic number, because the mean of its divisors is an integer number (5987340).

Almost surely, 2^78212065 is an apocalyptic number.

It is an amenable number.

78212065 is a deficient number, since it is larger than the sum of its proper divisors (17585375).

78212065 is a wasteful number, since it uses less digits than its factorization.

78212065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1152.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 78212065 is about 8843.7585335648. The cubic root of 78212065 is about 427.6527320396.

The spelling of 78212065 in words is "seventy-eight million, two hundred twelve thousand, sixty-five".