761647621 has 20 divisors (see below), whose sum is σ = 894919500. Its totient is φ = 648154752.

The previous prime is 761647613. The next prime is 761647633. The reversal of 761647621 is 126746167.

It can be written as a sum of positive squares in 2 ways, for example, as 137147521 + 624500100 = 11711^2 + 24990^2 .

It is not a de Polignac number, because 761647621 - 2³ = 761647613 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 (761647681) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 356685 + ... + 358813.

It is an arithmetic number, because the mean of its divisors is an integer number (44745975).

Almost surely, 2^761647621 is an apocalyptic number.

It is an amenable number.

761647621 is a deficient number, since it is larger than the sum of its proper divisors (133271879).

761647621 is an equidigital number, since it uses as much as digits as its factorization.

761647621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2306 (or 2285 counting only the distinct ones).

The product of its digits is 84672, while the sum is 40.

The square root of 761647621 is about 27597.9640734602. The cubic root of 761647621 is about 913.2395190047.

The spelling of 761647621 in words is "seven hundred sixty-one million, six hundred forty-seven thousand, six hundred twenty-one".