77448385 has 32 divisors (see below), whose sum is σ = 112379904. Its totient is φ = 50112000.

The previous prime is 77448347. The next prime is 77448409. The reversal of 77448385 is 58384477.

It is a de Polignac number, because none of the positive numbers 2^k-77448385 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43615 + ... + 45355.

It is an arithmetic number, because the mean of its divisors is an integer number (3511872).

Almost surely, 2^77448385 is an apocalyptic number.

It is an amenable number.

77448385 is a deficient number, since it is larger than the sum of its proper divisors (34931519).

77448385 is a wasteful number, since it uses less digits than its factorization.

77448385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1825.

The product of its digits is 752640, while the sum is 46.

The square root of 77448385 is about 8800.4764075589. The cubic root of 77448385 is about 426.2562782333.

It can be divided in two parts, 7744 and 8385, that added together give a square (16129 = 127²).

The spelling of 77448385 in words is "seventy-seven million, four hundred forty-eight thousand, three hundred eighty-five".