77421513 has 8 divisors (see below), whose sum is σ = 111169408. Its totient is φ = 47643984.

The previous prime is 77421493. The next prime is 77421527. The reversal of 77421513 is 31512477.

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

It is not a de Polignac number, because 77421513 - 2⁵ = 77421481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77421583) 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, 992545 + ... + 992622.

It is an arithmetic number, because the mean of its divisors is an integer number (13896176).

Almost surely, 2^77421513 is an apocalyptic number.

It is an amenable number.

77421513 is a deficient number, since it is larger than the sum of its proper divisors (33747895).

77421513 is a wasteful number, since it uses less digits than its factorization.

77421513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1985183.

The product of its digits is 5880, while the sum is 30.

The square root of 77421513 is about 8798.9495395757. The cubic root of 77421513 is about 426.2069736385.

The spelling of 77421513 in words is "seventy-seven million, four hundred twenty-one thousand, five hundred thirteen".