61820442 has 16 divisors (see below), whose sum is σ = 137378880. Its totient is φ = 20606796.

The previous prime is 61820399. The next prime is 61820453. The reversal of 61820442 is 24402816.

61820442 is a `hidden beast` number, since 618 + 2 + 0 + 4 + 42 = 666.

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 7 ways as a sum of consecutive naturals, for example, 572358 + ... + 572465.

It is an arithmetic number, because the mean of its divisors is an integer number (8586180).

Almost surely, 2^61820442 is an apocalyptic number.

61820442 is an abundant number, since it is smaller than the sum of its proper divisors (75558438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61820442 is a wasteful number, since it uses less digits than its factorization.

61820442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144834 (or 1144828 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 61820442 is about 7862.5976623505. The cubic root of 61820442 is about 395.4067102879.

The spelling of 61820442 in words is "sixty-one million, eight hundred twenty thousand, four hundred forty-two".