120721604 has 6 divisors (see below), whose sum is σ = 211262814. Its totient is φ = 60360800.

The previous prime is 120721583. The next prime is 120721613. The reversal of 120721604 is 406127021.

It can be written as a sum of positive squares in only one way, i.e., 93702400 + 27019204 = 9680^2 + 5198^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 120721604.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15090197 + ... + 15090204.

It is an arithmetic number, because the mean of its divisors is an integer number (35210469).

Almost surely, 2^120721604 is an apocalyptic number.

It is an amenable number.

120721604 is a deficient number, since it is larger than the sum of its proper divisors (90541210).

120721604 is a wasteful number, since it uses less digits than its factorization.

120721604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30180405 (or 30180403 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 120721604 is about 10987.3383492091. The cubic root of 120721604 is about 494.2291221889.

Adding to 120721604 its reverse (406127021), we get a palindrome (526848625).

The spelling of 120721604 in words is "one hundred twenty million, seven hundred twenty-one thousand, six hundred four".