61820145 has 32 divisors (see below), whose sum is σ = 111719040. Its totient is φ = 32425920.

The previous prime is 61820119. The next prime is 61820173. The reversal of 61820145 is 54102816.

61820145 is a `hidden beast` number, since 618 + 2 + 0 + 1 + 45 = 666.

It is not a de Polignac number, because 61820145 - 2¹² = 61816049 is a prime.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4482 + ... + 11988.

It is an arithmetic number, because the mean of its divisors is an integer number (3491220).

Almost surely, 2^61820145 is an apocalyptic number.

It is an amenable number.

61820145 is a deficient number, since it is larger than the sum of its proper divisors (49898895).

61820145 is a wasteful number, since it uses less digits than its factorization.

61820145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7582 (or 7576 counting only the distinct ones).

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

The square root of 61820145 is about 7862.5787754400. The cubic root of 61820145 is about 395.4060770778.

The spelling of 61820145 in words is "sixty-one million, eight hundred twenty thousand, one hundred forty-five".