77420539 has 12 divisors (see below), whose sum is σ = 92496864. Its totient is φ = 64565424.

The previous prime is 77420509. The next prime is 77420561. The reversal of 77420539 is 93502477.

It is not a de Polignac number, because 77420539 - 2¹¹ = 77418491 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77420498 and 77420507.

It is not an unprimeable number, because it can be changed into a prime (77420509) 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, 19539 + ... + 23164.

It is an arithmetic number, because the mean of its divisors is an integer number (7708072).

Almost surely, 2^77420539 is an apocalyptic number.

77420539 is a deficient number, since it is larger than the sum of its proper divisors (15076325).

77420539 is a wasteful number, since it uses less digits than its factorization.

77420539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42754 (or 42747 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 37.

The square root of 77420539 is about 8798.8941918857. The cubic root of 77420539 is about 426.2051863345.

The spelling of 77420539 in words is "seventy-seven million, four hundred twenty thousand, five hundred thirty-nine".