61904881 has 4 divisors (see below), whose sum is σ = 62320500. Its totient is φ = 61489264.

The previous prime is 61904873. The next prime is 61904893. The reversal of 61904881 is 18840916.

It is a happy number.

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 8381025 + 53523856 = 2895^2 + 7316^2 .

It is a cyclic number.

It is not a de Polignac number, because 61904881 - 2³ = 61904873 is a prime.

It is a super-2 number, since 2×61904881² = 7664428583248322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61904881.

It is not an unprimeable number, because it can be changed into a prime (61904281) 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, 207586 + ... + 207883.

It is an arithmetic number, because the mean of its divisors is an integer number (15580125).

Almost surely, 2^61904881 is an apocalyptic number.

It is an amenable number.

61904881 is a deficient number, since it is larger than the sum of its proper divisors (415619).

61904881 is a wasteful number, since it uses less digits than its factorization.

61904881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415618.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 61904881 is about 7867.9654930611. The cubic root of 61904881 is about 395.5866537742.

The spelling of 61904881 in words is "sixty-one million, nine hundred four thousand, eight hundred eighty-one".