61506490 has 8 divisors (see below), whose sum is σ = 110711700. Its totient is φ = 24602592.

The previous prime is 61506479. The next prime is 61506509. The reversal of 61506490 is 9460516.

It can be written as a sum of positive squares in 2 ways, for example, as 54037201 + 7469289 = 7351^2 + 2733^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 3075315 + ... + 3075334.

Almost surely, 2^61506490 is an apocalyptic number.

61506490 is a deficient number, since it is larger than the sum of its proper divisors (49205210).

61506490 is a wasteful number, since it uses less digits than its factorization.

61506490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6150656.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 61506490 is about 7842.6073470498. The cubic root of 61506490 is about 394.7362229729.

The spelling of 61506490 in words is "sixty-one million, five hundred six thousand, four hundred ninety".