77206620 has 24 divisors (see below), whose sum is σ = 216178704. Its totient is φ = 20588416.

The previous prime is 77206603. The next prime is 77206631. The reversal of 77206620 is 2660277.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 643329 + ... + 643448.

It is an arithmetic number, because the mean of its divisors is an integer number (9007446).

Almost surely, 2^77206620 is an apocalyptic number.

It is an amenable number.

77206620 is an abundant number, since it is smaller than the sum of its proper divisors (138972084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77206620 is a wasteful number, since it uses less digits than its factorization.

77206620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286789 (or 1286787 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 77206620 is about 8786.7297670977. The cubic root of 77206620 is about 425.8122781535.

Adding to 77206620 its reverse (2660277), we get a palindrome (79866897).

The spelling of 77206620 in words is "seventy-seven million, two hundred six thousand, six hundred twenty".