61520890 has 16 divisors (see below), whose sum is σ = 114556680. Its totient is φ = 23759680.

The previous prime is 61520887. The next prime is 61520891. The reversal of 61520890 is 9802516.

It can be written as a sum of positive squares in 4 ways, for example, as 55756089 + 5764801 = 7467^2 + 2401^2 .

It is not an unprimeable number, because it can be changed into a prime (61520891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105781 + ... + 106360.

Almost surely, 2^61520890 is an apocalyptic number.

61520890 is a deficient number, since it is larger than the sum of its proper divisors (53035790).

61520890 is a wasteful number, since it uses less digits than its factorization.

61520890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212177.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 61520890 is about 7843.5253553488. The cubic root of 61520890 is about 394.7670259991.

The spelling of 61520890 in words is "sixty-one million, five hundred twenty thousand, eight hundred ninety".