77248331 has 4 divisors (see below), whose sum is σ = 77379192. Its totient is φ = 77117472.

The previous prime is 77248321. The next prime is 77248337. The reversal of 77248331 is 13384277.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13384277 = 3391 ⋅3947.

It is a cyclic number.

It is not a de Polignac number, because 77248331 - 2¹⁸ = 76986187 is a prime.

It is a super-2 number, since 2×77248331² = 11934609284571122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77248291 and 77248300.

It is not an unprimeable number, because it can be changed into a prime (77248337) 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, 64541 + ... + 65726.

It is an arithmetic number, because the mean of its divisors is an integer number (19344798).

Almost surely, 2^77248331 is an apocalyptic number.

77248331 is a deficient number, since it is larger than the sum of its proper divisors (130861).

77248331 is a wasteful number, since it uses less digits than its factorization.

77248331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130860.

The product of its digits is 28224, while the sum is 35.

The square root of 77248331 is about 8789.1029690179. The cubic root of 77248331 is about 425.8889462700. Note that the first 3 decimals are identical.

The spelling of 77248331 in words is "seventy-seven million, two hundred forty-eight thousand, three hundred thirty-one".