78161265 has 48 divisors (see below), whose sum is σ = 166752768. Its totient is φ = 32980608.

The previous prime is 78161249. The next prime is 78161287. The reversal of 78161265 is 56216187.

It is not a de Polignac number, because 78161265 - 2⁴ = 78161249 is a prime.

It is a super-2 number, since 2×78161265² = 12218366692800450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5449 + ... + 13638.

It is an arithmetic number, because the mean of its divisors is an integer number (3474016).

Almost surely, 2^78161265 is an apocalyptic number.

It is an amenable number.

78161265 is an abundant number, since it is smaller than the sum of its proper divisors (88591503).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78161265 is a wasteful number, since it uses less digits than its factorization.

78161265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19118 (or 19115 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 78161265 is about 8840.8859850130. The cubic root of 78161265 is about 427.5601228665.

The spelling of 78161265 in words is "seventy-eight million, one hundred sixty-one thousand, two hundred sixty-five".