7634780021 has 8 divisors (see below), whose sum is σ = 8329755744. Its totient is φ = 6939955120.

The previous prime is 7634780017. The next prime is 7634780077. The reversal of 7634780021 is 1200874367.

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

It is a cyclic number.

It is not a de Polignac number, because 7634780021 - 2² = 7634780017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7634780821) 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, 85730 + ... + 150396.

It is an arithmetic number, because the mean of its divisors is an integer number (1041219468).

Almost surely, 2^7634780021 is an apocalyptic number.

It is an amenable number.

7634780021 is a deficient number, since it is larger than the sum of its proper divisors (694975723).

7634780021 is a wasteful number, since it uses less digits than its factorization.

7634780021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75411.

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 7634780021 is about 87377.2282748772. The cubic root of 7634780021 is about 1969.0897407727.

The spelling of 7634780021 in words is "seven billion, six hundred thirty-four million, seven hundred eighty thousand, twenty-one".