77954643 has 24 divisors (see below), whose sum is σ = 125759088. Its totient is φ = 47970144.

The previous prime is 77954629. The next prime is 77954647. The reversal of 77954643 is 34645977.

It is not a de Polignac number, because 77954643 - 2⁴ = 77954627 is a prime.

It is a super-4 number, since 4×77954643⁴ (a number of 33 digits) contains 4444 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (77954647) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9180 + ... + 15497.

It is an arithmetic number, because the mean of its divisors is an integer number (5239962).

Almost surely, 2^77954643 is an apocalyptic number.

77954643 is a deficient number, since it is larger than the sum of its proper divisors (47804445).

77954643 is a wasteful number, since it uses less digits than its factorization.

77954643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24705 (or 24693 counting only the distinct ones).

The product of its digits is 635040, while the sum is 45.

The square root of 77954643 is about 8829.1926584484. The cubic root of 77954643 is about 427.1830337442.

The spelling of 77954643 in words is "seventy-seven million, nine hundred fifty-four thousand, six hundred forty-three".