75120621 has 8 divisors (see below), whose sum is σ = 100407360. Its totient is φ = 49957152.

The previous prime is 75120607. The next prime is 75120641. The reversal of 75120621 is 12602157.

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

It is a de Polignac number, because none of the positive numbers 2^k-75120621 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 75120591 and 75120600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75120641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29385 + ... + 31838.

It is an arithmetic number, because the mean of its divisors is an integer number (12550920).

Almost surely, 2^75120621 is an apocalyptic number.

It is an amenable number.

75120621 is a deficient number, since it is larger than the sum of its proper divisors (25286739).

75120621 is a wasteful number, since it uses less digits than its factorization.

75120621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61635.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 75120621 is about 8667.2152967375. The cubic root of 75120621 is about 421.9422908739.

Adding to 75120621 its reverse (12602157), we get a palindrome (87722778).

The spelling of 75120621 in words is "seventy-five million, one hundred twenty thousand, six hundred twenty-one".