77420075 has 12 divisors (see below), whose sum is σ = 96420168. Its totient is φ = 61665600.

The previous prime is 77420071. The next prime is 77420137. The reversal of 77420075 is 57002477.

It is a happy number.

It is not a de Polignac number, because 77420075 - 2² = 77420071 is a prime.

It is a super-3 number, since 3×77420075³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77420071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 821 + ... + 12470.

It is an arithmetic number, because the mean of its divisors is an integer number (8035014).

Almost surely, 2^77420075 is an apocalyptic number.

77420075 is a deficient number, since it is larger than the sum of its proper divisors (19000093).

77420075 is a wasteful number, since it uses less digits than its factorization.

77420075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13534 (or 13529 counting only the distinct ones).

The product of its (nonzero) digits is 13720, while the sum is 32.

The square root of 77420075 is about 8798.8678248966. The cubic root of 77420075 is about 426.2043348826.

The spelling of 77420075 in words is "seventy-seven million, four hundred twenty thousand, seventy-five".