77698945 has 8 divisors (see below), whose sum is σ = 97292736. Its totient is φ = 59456496.

The previous prime is 77698931. The next prime is 77698969. The reversal of 77698945 is 54989677.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77698945 - 2⁹ = 77698433 is a prime.

It is a super-2 number, since 2×77698945² = 12074252108226050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 337707 + ... + 337936.

It is an arithmetic number, because the mean of its divisors is an integer number (12161592).

Almost surely, 2^77698945 is an apocalyptic number.

It is an amenable number.

77698945 is a deficient number, since it is larger than the sum of its proper divisors (19593791).

77698945 is a wasteful number, since it uses less digits than its factorization.

77698945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675671.

The product of its digits is 3810240, while the sum is 55.

The square root of 77698945 is about 8814.7005054057. The cubic root of 77698945 is about 426.7154563212.

The spelling of 77698945 in words is "seventy-seven million, six hundred ninety-eight thousand, nine hundred forty-five".