77373643 has 4 divisors (see below), whose sum is σ = 81445960. Its totient is φ = 73301328.

The previous prime is 77373619. The next prime is 77373671. The reversal of 77373643 is 34637377.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77373643 - 2¹³ = 77365451 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77373596 and 77373605.

It is not an unprimeable number, because it can be changed into a prime (77373743) 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, 2036130 + ... + 2036167.

It is an arithmetic number, because the mean of its divisors is an integer number (20361490).

Almost surely, 2^77373643 is an apocalyptic number.

77373643 is a deficient number, since it is larger than the sum of its proper divisors (4072317).

77373643 is a wasteful number, since it uses less digits than its factorization.

77373643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4072316.

The product of its digits is 222264, while the sum is 40.

The square root of 77373643 is about 8796.2289078900. The cubic root of 77373643 is about 426.1191137596.

The spelling of 77373643 in words is "seventy-seven million, three hundred seventy-three thousand, six hundred forty-three".