77723513 has 4 divisors (see below), whose sum is σ = 88826880. Its totient is φ = 66620148.

The previous prime is 77723501. The next prime is 77723521. The reversal of 77723513 is 31532777.

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 77723513 - 2⁶ = 77723449 is a prime.

It is a super-2 number, since 2×77723513² = 12081888946122338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77723533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5551673 + ... + 5551686.

It is an arithmetic number, because the mean of its divisors is an integer number (22206720).

Almost surely, 2^77723513 is an apocalyptic number.

It is an amenable number.

77723513 is a deficient number, since it is larger than the sum of its proper divisors (11103367).

77723513 is a wasteful number, since it uses less digits than its factorization.

77723513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11103366.

The product of its digits is 30870, while the sum is 35.

The square root of 77723513 is about 8816.0939763594. The cubic root of 77723513 is about 426.7604266468.

The spelling of 77723513 in words is "seventy-seven million, seven hundred twenty-three thousand, five hundred thirteen".