78330761 has 4 divisors (see below), whose sum is σ = 78357012. Its totient is φ = 78304512.

The previous prime is 78330751. The next prime is 78330823. The reversal of 78330761 is 16703387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16703387 = 157 ⋅106391.

It can be written as a sum of positive squares in 2 ways, for example, as 59969536 + 18361225 = 7744^2 + 4285^2 .

It is a cyclic number.

It is not a de Polignac number, because 78330761 - 2¹⁴ = 78314377 is a prime.

It is a super-2 number, since 2×78330761² = 12271416237678242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78330731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7976 + ... + 14841.

It is an arithmetic number, because the mean of its divisors is an integer number (19589253).

Almost surely, 2^78330761 is an apocalyptic number.

It is an amenable number.

78330761 is a deficient number, since it is larger than the sum of its proper divisors (26251).

78330761 is a wasteful number, since it uses less digits than its factorization.

78330761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26250.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 78330761 is about 8850.4667108577. The cubic root of 78330761 is about 427.8689604518.

The spelling of 78330761 in words is "seventy-eight million, three hundred thirty thousand, seven hundred sixty-one".