61280145 has 40 divisors (see below), whose sum is σ = 111234816. Its totient is φ = 32271264.

The previous prime is 61280129. The next prime is 61280147. The reversal of 61280145 is 54108216.

61280145 is a `hidden beast` number, since 612 + 8 + 0 + 1 + 45 = 666.

It is not a de Polignac number, because 61280145 - 2⁴ = 61280129 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (61280147) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 32704 + ... + 34526.

Almost surely, 2^61280145 is an apocalyptic number.

It is an amenable number.

61280145 is a deficient number, since it is larger than the sum of its proper divisors (49954671).

61280145 is a wasteful number, since it uses less digits than its factorization.

61280145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1923 (or 1914 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 61280145 is about 7828.1635777493. The cubic root of 61280145 is about 394.2514156298.

It can be divided in two parts, 61280 and 145, that added together give a triangular number (61425 = T₃₅₀).

The spelling of 61280145 in words is "sixty-one million, two hundred eighty thousand, one hundred forty-five".