78305773 has 12 divisors (see below), whose sum is σ = 98098140. Its totient is φ = 61955712.

The previous prime is 78305767. The next prime is 78305809. The reversal of 78305773 is 37750387.

It can be written as a sum of positive squares in 2 ways, for example, as 7038409 + 71267364 = 2653^2 + 8442^2 .

It is not a de Polignac number, because 78305773 - 2¹³ = 78297581 is a prime.

It is a super-2 number, since 2×78305773² = 12263588170255058, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78305753) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60828 + ... + 62101.

It is an arithmetic number, because the mean of its divisors is an integer number (8174845).

Almost surely, 2^78305773 is an apocalyptic number.

It is an amenable number.

78305773 is a deficient number, since it is larger than the sum of its proper divisors (19792367).

78305773 is a wasteful number, since it uses less digits than its factorization.

78305773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122956 (or 122949 counting only the distinct ones).

The product of its (nonzero) digits is 123480, while the sum is 40.

The square root of 78305773 is about 8849.0549212896. The cubic root of 78305773 is about 427.8234579930.

The spelling of 78305773 in words is "seventy-eight million, three hundred five thousand, seven hundred seventy-three".