77641249 has 8 divisors (see below), whose sum is σ = 90897408. Its totient is φ = 64926240.

The previous prime is 77641247. The next prime is 77641253. The reversal of 77641249 is 94214677.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77641249 - 2¹ = 77641247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77641247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134977 + ... + 135550.

It is an arithmetic number, because the mean of its divisors is an integer number (11362176).

Almost surely, 2^77641249 is an apocalyptic number.

It is an amenable number.

77641249 is a deficient number, since it is larger than the sum of its proper divisors (13256159).

77641249 is a wasteful number, since it uses less digits than its factorization.

77641249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270575.

The product of its digits is 84672, while the sum is 40.

The square root of 77641249 is about 8811.4271829256. The cubic root of 77641249 is about 426.6098097929.

It can be divided in two parts, 776 and 41249, that added together give a square (42025 = 205²).

The spelling of 77641249 in words is "seventy-seven million, six hundred forty-one thousand, two hundred forty-nine".