61921854 has 32 divisors (see below), whose sum is σ = 145700640. Its totient is φ = 19426176.

The previous prime is 61921789. The next prime is 61921879. The reversal of 61921854 is 45812916.

It is a congruent number.

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, 32809 + ... + 34644.

It is an arithmetic number, because the mean of its divisors is an integer number (4553145).

Almost surely, 2^61921854 is an apocalyptic number.

61921854 is an abundant number, since it is smaller than the sum of its proper divisors (83778786).

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

61921854 is a wasteful number, since it uses less digits than its factorization.

61921854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67481 (or 67475 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 61921854 is about 7869.0440334262. The cubic root of 61921854 is about 395.6228042824.

The spelling of 61921854 in words is "sixty-one million, nine hundred twenty-one thousand, eight hundred fifty-four".