97782457 has 4 divisors (see below), whose sum is σ = 97811200. Its totient is φ = 97753716.

The previous prime is 97782439. The next prime is 97782467. The reversal of 97782457 is 75428779.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75428779 = 17 ⋅4436987.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97782457 is a prime.

It is a super-2 number, since 2×97782457² = 19122817793913698, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 97782457.

It is not an unprimeable number, because it can be changed into a prime (97782427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8457 + ... + 16342.

It is an arithmetic number, because the mean of its divisors is an integer number (24452800).

Almost surely, 2^97782457 is an apocalyptic number.

It is an amenable number.

97782457 is a deficient number, since it is larger than the sum of its proper divisors (28743).

97782457 is a wasteful number, since it uses less digits than its factorization.

97782457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28742.

The product of its digits is 987840, while the sum is 49.

The square root of 97782457 is about 9888.5012514536. The cubic root of 97782457 is about 460.7022308394.

The spelling of 97782457 in words is "ninety-seven million, seven hundred eighty-two thousand, four hundred fifty-seven".