77487813 has 32 divisors (see below), whose sum is σ = 124252800. Its totient is φ = 47443968.

The previous prime is 77487803. The next prime is 77487841. The reversal of 77487813 is 31878477.

It is a happy number.

It is not a de Polignac number, because 77487813 - 2¹² = 77483717 is a prime.

It is a super-2 number, since 2×77487813² = 12008722327045938, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77487803) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 89778 + ... + 90636.

It is an arithmetic number, because the mean of its divisors is an integer number (3882900).

Almost surely, 2^77487813 is an apocalyptic number.

It is an amenable number.

77487813 is a deficient number, since it is larger than the sum of its proper divisors (46764987).

77487813 is a wasteful number, since it uses less digits than its factorization.

77487813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1138 (or 1132 counting only the distinct ones).

The product of its digits is 263424, while the sum is 45.

The square root of 77487813 is about 8802.7162285286. The cubic root of 77487813 is about 426.3285998677.

The spelling of 77487813 in words is "seventy-seven million, four hundred eighty-seven thousand, eight hundred thirteen".