7421651328 has 192 divisors, whose sum is σ = 24697174320. Its totient is φ = 1957294080.

The previous prime is 7421651309. The next prime is 7421651357. The reversal of 7421651328 is 8231561247.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 229438 + ... + 259778.

Almost surely, 2^7421651328 is an apocalyptic number.

7421651328 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7421651328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12348587160).

7421651328 is an abundant number, since it is smaller than the sum of its proper divisors (17275522992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7421651328 is a wasteful number, since it uses less digits than its factorization.

7421651328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30385 (or 30366 counting only the distinct ones).

The product of its digits is 80640, while the sum is 39.

The square root of 7421651328 is about 86149.0065409927. The cubic root of 7421651328 is about 1950.5938430673.

The spelling of 7421651328 in words is "seven billion, four hundred twenty-one million, six hundred fifty-one thousand, three hundred twenty-eight".