77521045 has 32 divisors (see below), whose sum is σ = 114554880. Its totient is φ = 49170240.

The previous prime is 77521027. The next prime is 77521079. The reversal of 77521045 is 54012577.

It is not a de Polignac number, because 77521045 - 2⁹ = 77520533 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77520998 and 77521016.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 27240 + ... + 29950.

It is an arithmetic number, because the mean of its divisors is an integer number (3579840).

Almost surely, 2^77521045 is an apocalyptic number.

It is an amenable number.

77521045 is a deficient number, since it is larger than the sum of its proper divisors (37033835).

77521045 is a wasteful number, since it uses less digits than its factorization.

77521045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2785.

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 77521045 is about 8804.6036253769. The cubic root of 77521045 is about 426.3895373090.

The spelling of 77521045 in words is "seventy-seven million, five hundred twenty-one thousand, forty-five".