61507638 has 12 divisors (see below), whose sum is σ = 133266588. Its totient is φ = 20502540.

The previous prime is 61507619. The next prime is 61507669. The reversal of 61507638 is 83670516.

61507638 is a `hidden beast` number, since 6 + 15 + 0 + 7 + 638 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1708528 + ... + 1708563.

It is an arithmetic number, because the mean of its divisors is an integer number (11105549).

Almost surely, 2^61507638 is an apocalyptic number.

61507638 is an abundant number, since it is smaller than the sum of its proper divisors (71758950).

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

61507638 is a wasteful number, since it uses less digits than its factorization.

61507638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3417099 (or 3417096 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 61507638 is about 7842.6805366533. The cubic root of 61507638 is about 394.7386788350.

The spelling of 61507638 in words is "sixty-one million, five hundred seven thousand, six hundred thirty-eight".