7547421064 has 8 divisors (see below), whose sum is σ = 14151414510. Its totient is φ = 3773710528.

The previous prime is 7547421059. The next prime is 7547421067. The reversal of 7547421064 is 4601247457.

It can be written as a sum of positive squares in only one way, i.e., 3986912164 + 3560508900 = 63142^2 + 59670^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (7547421067) 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 as a sum of consecutive naturals, namely, 471713809 + ... + 471713824.

Almost surely, 2^7547421064 is an apocalyptic number.

It is an amenable number.

7547421064 is a deficient number, since it is larger than the sum of its proper divisors (6603993446).

7547421064 is a wasteful number, since it uses less digits than its factorization.

7547421064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943427639 (or 943427635 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 40.

The square root of 7547421064 is about 86875.8946083435. The cubic root of 7547421064 is about 1961.5506491857.

The spelling of 7547421064 in words is "seven billion, five hundred forty-seven million, four hundred twenty-one thousand, sixty-four".