102720434 has 8 divisors (see below), whose sum is σ = 155606508. Its totient is φ = 50851600.

The previous prime is 102720383. The next prime is 102720439. The reversal of 102720434 is 434027201.

It can be written as a sum of positive squares in 2 ways, for example, as 102718225 + 2209 = 10135^2 + 47^2 .

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

It is a super-2 number, since 2×102720434² = 21102975122296712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (102720439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254057 + ... + 254460.

Almost surely, 2^102720434 is an apocalyptic number.

102720434 is a deficient number, since it is larger than the sum of its proper divisors (52886074).

102720434 is a wasteful number, since it uses less digits than its factorization.

102720434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508620.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 102720434 is about 10135.1089782005. The cubic root of 102720434 is about 468.3303272168.

Adding to 102720434 its reverse (434027201), we get a palindrome (536747635).

The spelling of 102720434 in words is "one hundred two million, seven hundred twenty thousand, four hundred thirty-four".