78373773 has 6 divisors (see below), whose sum is σ = 113206574. Its totient is φ = 52249176.

The previous prime is 78373741. The next prime is 78373777. The reversal of 78373773 is 37737387.

It can be written as a sum of positive squares in only one way, i.e., 44116164 + 34257609 = 6642^2 + 5853^2 .

It is not a de Polignac number, because 78373773 - 2⁵ = 78373741 is a prime.

It is a super-2 number, since 2×78373773² = 12284896588511058, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78373777) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4354090 + ... + 4354107.

Almost surely, 2^78373773 is an apocalyptic number.

It is an amenable number.

78373773 is a deficient number, since it is larger than the sum of its proper divisors (34832801).

78373773 is a wasteful number, since it uses less digits than its factorization.

78373773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8708203 (or 8708200 counting only the distinct ones).

The product of its digits is 518616, while the sum is 45.

The square root of 78373773 is about 8852.8963057296. The cubic root of 78373773 is about 427.9472614582.

The spelling of 78373773 in words is "seventy-eight million, three hundred seventy-three thousand, seven hundred seventy-three".