77739081 has 32 divisors (see below), whose sum is σ = 122634240. Its totient is φ = 42883776.

The previous prime is 77739043. The next prime is 77739091. The reversal of 77739081 is 18093777.

It is a happy number.

It is not a de Polignac number, because 77739081 - 2⁷ = 77738953 is a prime.

It is a super-2 number, since 2×77739081² = 12086729429449122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77739091) 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, 77475 + ... + 78471.

It is an arithmetic number, because the mean of its divisors is an integer number (3832320).

Almost surely, 2^77739081 is an apocalyptic number.

It is an amenable number.

77739081 is a deficient number, since it is larger than the sum of its proper divisors (44895159).

77739081 is a wasteful number, since it uses less digits than its factorization.

77739081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133.

The product of its (nonzero) digits is 74088, while the sum is 42.

The square root of 77739081 is about 8816.9768628482. The cubic root of 77739081 is about 426.7889180798.

The spelling of 77739081 in words is "seventy-seven million, seven hundred thirty-nine thousand, eighty-one".