77540551 has 12 divisors (see below), whose sum is σ = 85465800. Its totient is φ = 70297040.

The previous prime is 77540531. The next prime is 77540599. The reversal of 77540551 is 15504577.

It is a happy number.

It is not a de Polignac number, because 77540551 - 2⁷ = 77540423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77540531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60960 + ... + 62218.

It is an arithmetic number, because the mean of its divisors is an integer number (7122150).

Almost surely, 2^77540551 is an apocalyptic number.

77540551 is a deficient number, since it is larger than the sum of its proper divisors (7925249).

77540551 is a wasteful number, since it uses less digits than its factorization.

77540551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1790 (or 1779 counting only the distinct ones).

The product of its (nonzero) digits is 24500, while the sum is 34.

The square root of 77540551 is about 8805.7112716691. The cubic root of 77540551 is about 426.4252973051.

The spelling of 77540551 in words is "seventy-seven million, five hundred forty thousand, five hundred fifty-one".