77649851 has 4 divisors (see below), whose sum is σ = 78808872. Its totient is φ = 76490832.

The previous prime is 77649797. The next prime is 77649853. The reversal of 77649851 is 15894677.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15894677 = 17 ⋅934981.

It is a cyclic number.

It is not a de Polignac number, because 77649851 - 2¹⁴ = 77633467 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77649796 and 77649805.

It is not an unprimeable number, because it can be changed into a prime (77649853) 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, 579410 + ... + 579543.

It is an arithmetic number, because the mean of its divisors is an integer number (19702218).

Almost surely, 2^77649851 is an apocalyptic number.

77649851 is a deficient number, since it is larger than the sum of its proper divisors (1159021).

77649851 is a wasteful number, since it uses less digits than its factorization.

77649851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1159020.

The product of its digits is 423360, while the sum is 47.

The square root of 77649851 is about 8811.9152855665. The cubic root of 77649851 is about 426.6255641422.

The spelling of 77649851 in words is "seventy-seven million, six hundred forty-nine thousand, eight hundred fifty-one".