7561421280 has 600 divisors, whose sum is σ = 31259361672. Its totient is φ = 1728324864.

The previous prime is 7561421267. The next prime is 7561421293. The reversal of 7561421280 is 821241657.

7561421280 is a `hidden beast` number, since 7 + 561 + 4 + 2 + 12 + 80 = 666.

It is an interprime number because it is at equal distance from previous prime (7561421267) and next prime (7561421293).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 in 99 ways as a sum of consecutive naturals, for example, 1080203037 + ... + 1080203043.

Almost surely, 2^7561421280 is an apocalyptic number.

7561421280 is a gapful number since it is divisible by the number (70) 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 7561421280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15629680836).

7561421280 is an abundant number, since it is smaller than the sum of its proper divisors (23697940392).

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

7561421280 is an frugal number, since it uses more digits than its factorization.

7561421280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70 (or 17 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 7561421280 is about 86956.4332295202. The cubic root of 7561421280 is about 1962.7627704997.

The spelling of 7561421280 in words is "seven billion, five hundred sixty-one million, four hundred twenty-one thousand, two hundred eighty".