77743897 has 16 divisors (see below), whose sum is σ = 97372800. Its totient is φ = 60301440.

The previous prime is 77743889. The next prime is 77743921. The reversal of 77743897 is 79834777.

It is a cyclic number.

It is not a de Polignac number, because 77743897 - 2³ = 77743889 is a prime.

It is a super-2 number, since 2×77743897² = 12088227041493218, which contains 22 as substring.

It is a deceptive number, since it divides R_77743896.

It is not an unprimeable number, because it can be changed into a prime (77743807) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 15429 + ... + 19837.

It is an arithmetic number, because the mean of its divisors is an integer number (6085800).

Almost surely, 2^77743897 is an apocalyptic number.

77743897 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

77743897 is the 4409-th decagonal number.

It is an amenable number.

77743897 is a deficient number, since it is larger than the sum of its proper divisors (19628903).

77743897 is a wasteful number, since it uses less digits than its factorization.

77743897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4656.

The product of its digits is 2074464, while the sum is 52.

The square root of 77743897 is about 8817.2499681023. The cubic root of 77743897 is about 426.7977312060.

The spelling of 77743897 in words is "seventy-seven million, seven hundred forty-three thousand, eight hundred ninety-seven".