77209540 has 24 divisors (see below), whose sum is σ = 170674560. Its totient is φ = 29258208.

The previous prime is 77209507. The next prime is 77209541. The reversal of 77209540 is 4590277.

It is a super-2 number, since 2×77209540² = 11922626134023200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 77209496 and 77209505.

It is not an unprimeable number, because it can be changed into a prime (77209541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101212 + ... + 101971.

It is an arithmetic number, because the mean of its divisors is an integer number (7111440).

Almost surely, 2^77209540 is an apocalyptic number.

It is an amenable number.

77209540 is an abundant number, since it is smaller than the sum of its proper divisors (93465020).

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

77209540 is a wasteful number, since it uses less digits than its factorization.

77209540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203211 (or 203209 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 77209540 is about 8786.8959251831. The cubic root of 77209540 is about 425.8176462432.

The spelling of 77209540 in words is "seventy-seven million, two hundred nine thousand, five hundred forty".