77350721 has 4 divisors (see below), whose sum is σ = 88400832. Its totient is φ = 66300612.

The previous prime is 77350709. The next prime is 77350753. The reversal of 77350721 is 12705377.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 77350721 - 2⁶ = 77350657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77350321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5525045 + ... + 5525058.

It is an arithmetic number, because the mean of its divisors is an integer number (22100208).

Almost surely, 2^77350721 is an apocalyptic number.

It is an amenable number.

77350721 is a deficient number, since it is larger than the sum of its proper divisors (11050111).

77350721 is a wasteful number, since it uses less digits than its factorization.

77350721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11050110.

The product of its (nonzero) digits is 10290, while the sum is 32.

The square root of 77350721 is about 8794.9258666574. The cubic root of 77350721 is about 426.0770302342.

The spelling of 77350721 in words is "seventy-seven million, three hundred fifty thousand, seven hundred twenty-one".