77720470 has 8 divisors (see below), whose sum is σ = 139896864. Its totient is φ = 31088184.

The previous prime is 77720459. The next prime is 77720471. The reversal of 77720470 is 7402777.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77720471) 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, 3886014 + ... + 3886033.

It is an arithmetic number, because the mean of its divisors is an integer number (17487108).

Almost surely, 2^77720470 is an apocalyptic number.

77720470 is a deficient number, since it is larger than the sum of its proper divisors (62176394).

77720470 is a wasteful number, since it uses less digits than its factorization.

77720470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7772054.

The product of its (nonzero) digits is 19208, while the sum is 34.

The square root of 77720470 is about 8815.9213925715. The cubic root of 77720470 is about 426.7548571227.

The spelling of 77720470 in words is "seventy-seven million, seven hundred twenty thousand, four hundred seventy".