61902649 has 4 divisors (see below), whose sum is σ = 61940340. Its totient is φ = 61864960.

The previous prime is 61902647. The next prime is 61902653. The reversal of 61902649 is 94620916.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52490025 + 9412624 = 7245^2 + 3068^2 .

It is a cyclic number.

It is not a de Polignac number, because 61902649 - 2¹ = 61902647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61902647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16264 + ... + 19705.

It is an arithmetic number, because the mean of its divisors is an integer number (15485085).

Almost surely, 2^61902649 is an apocalyptic number.

It is an amenable number.

61902649 is a deficient number, since it is larger than the sum of its proper divisors (37691).

61902649 is a wasteful number, since it uses less digits than its factorization.

61902649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37690.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 61902649 is about 7867.8236507944. The cubic root of 61902649 is about 395.5818993832.

The spelling of 61902649 in words is "sixty-one million, nine hundred two thousand, six hundred forty-nine".