76637421 has 30 divisors (see below), whose sum is σ = 133181070. Its totient is φ = 43790544.

The previous prime is 76637419. The next prime is 76637437. The reversal of 76637421 is 12473667.

It can be written as a sum of positive squares in only one way, i.e., 52490025 + 24147396 = 7245^2 + 4914^2 .

It is not a de Polignac number, because 76637421 - 2¹ = 76637419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76637441) 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 in 29 ways as a sum of consecutive naturals, for example, 5686 + ... + 13623.

It is an arithmetic number, because the mean of its divisors is an integer number (4439369).

Almost surely, 2^76637421 is an apocalyptic number.

It is an amenable number.

76637421 is a deficient number, since it is larger than the sum of its proper divisors (56543649).

76637421 is a wasteful number, since it uses less digits than its factorization.

76637421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19335 (or 19319 counting only the distinct ones).

The product of its digits is 42336, while the sum is 36.

The square root of 76637421 is about 8754.2801531594. The cubic root of 76637421 is about 424.7632748582.

The spelling of 76637421 in words is "seventy-six million, six hundred thirty-seven thousand, four hundred twenty-one".