78262749 has 12 divisors (see below), whose sum is σ = 113457916. Its totient is φ = 51985152.

The previous prime is 78262739. The next prime is 78262787. The reversal of 78262749 is 94726287.

It can be written as a sum of positive squares in 2 ways, for example, as 52099524 + 26163225 = 7218^2 + 5115^2 .

It is not a de Polignac number, because 78262749 - 2⁸ = 78262493 is a prime.

It is a super-2 number, since 2×78262749² = 12250115762074002, 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 (78262739) 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, 13204 + ... + 18189.

Almost surely, 2^78262749 is an apocalyptic number.

It is an amenable number.

78262749 is a deficient number, since it is larger than the sum of its proper divisors (35195167).

78262749 is a wasteful number, since it uses less digits than its factorization.

78262749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31676 (or 31673 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 78262749 is about 8846.6235932134. The cubic root of 78262749 is about 427.7450897881.

The spelling of 78262749 in words is "seventy-eight million, two hundred sixty-two thousand, seven hundred forty-nine".