60639440 has 20 divisors (see below), whose sum is σ = 140986884. Its totient is φ = 24255744.

The previous prime is 60639427. The next prime is 60639457. The reversal of 60639440 is 4493606.

It can be written as a sum of positive squares in 2 ways, for example, as 6822544 + 53816896 = 2612^2 + 7336^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 60639397 and 60639406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 378917 + ... + 379076.

Almost surely, 2^60639440 is an apocalyptic number.

It is an amenable number.

60639440 is an abundant number, since it is smaller than the sum of its proper divisors (80347444).

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

60639440 is a wasteful number, since it uses less digits than its factorization.

60639440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758006 (or 758000 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 60639440 is about 7787.1329769049. The cubic root of 60639440 is about 392.8725876336.

The spelling of 60639440 in words is "sixty million, six hundred thirty-nine thousand, four hundred forty".