61680235 has 16 divisors (see below), whose sum is σ = 76677120. Its totient is φ = 47581920.

The previous prime is 61680191. The next prime is 61680253. The reversal of 61680235 is 53208616.

61680235 = T₆₄₁₁ + T₆₄₁₂ + T₆₄₁₃.

It is a de Polignac number, because none of the positive numbers 2^k-61680235 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a junction number, because it is equal to n+sod(n) for n = 61680197 and 61680206.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58846 + ... + 59884.

It is an arithmetic number, because the mean of its divisors is an integer number (4792320).

Almost surely, 2^61680235 is an apocalyptic number.

61680235 is the 6413-rd centered triangular number.

61680235 is a deficient number, since it is larger than the sum of its proper divisors (14996885).

61680235 is a wasteful number, since it uses less digits than its factorization.

61680235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 61680235 is about 7853.6765275888. The cubic root of 61680235 is about 395.1075603039.

The spelling of 61680235 in words is "sixty-one million, six hundred eighty thousand, two hundred thirty-five".