77720475 has 48 divisors (see below), whose sum is σ = 147633408. Its totient is φ = 35341440.

The previous prime is 77720471. The next prime is 77720497. The reversal of 77720475 is 57402777.

It is not a de Polignac number, because 77720475 - 2² = 77720471 is a prime.

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 47 ways as a sum of consecutive naturals, for example, 166192 + ... + 166658.

It is an arithmetic number, because the mean of its divisors is an integer number (3075696).

Almost surely, 2^77720475 is an apocalyptic number.

77720475 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

77720475 is a deficient number, since it is larger than the sum of its proper divisors (69912933).

77720475 is a wasteful number, since it uses less digits than its factorization.

77720475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804 (or 799 counting only the distinct ones).

The product of its (nonzero) digits is 96040, while the sum is 39.

The square root of 77720475 is about 8815.9216761494. The cubic root of 77720475 is about 426.7548662742.

The spelling of 77720475 in words is "seventy-seven million, seven hundred twenty thousand, four hundred seventy-five".