78264765 has 32 divisors (see below), whose sum is σ = 143942400. Its totient is φ = 40299840.

The previous prime is 78264763. The next prime is 78264779. The reversal of 78264765 is 56746287.

It is not a de Polignac number, because 78264765 - 2¹ = 78264763 is a prime.

It is a super-2 number, since 2×78264765² = 12250746881010450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78264765.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78264761) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6081 + ... + 13910.

It is an arithmetic number, because the mean of its divisors is an integer number (4498200).

Almost surely, 2^78264765 is an apocalyptic number.

It is an amenable number.

78264765 is a deficient number, since it is larger than the sum of its proper divisors (65677635).

78264765 is a wasteful number, since it uses less digits than its factorization.

78264765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20034 (or 20028 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The square root of 78264765 is about 8846.7375342552. The cubic root of 78264765 is about 427.7487625729.

The spelling of 78264765 in words is "seventy-eight million, two hundred sixty-four thousand, seven hundred sixty-five".