61939945 has 8 divisors (see below), whose sum is σ = 74370240. Its totient is φ = 49523760.

The previous prime is 61939931. The next prime is 61939973. The reversal of 61939945 is 54993916.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61939945 - 2²¹ = 59842793 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61939895 and 61939904.

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, 14796 + ... + 18514.

It is an arithmetic number, because the mean of its divisors is an integer number (9296280).

Almost surely, 2^61939945 is an apocalyptic number.

It is an amenable number.

61939945 is a deficient number, since it is larger than the sum of its proper divisors (12430295).

61939945 is a wasteful number, since it uses less digits than its factorization.

61939945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7055.

The product of its digits is 262440, while the sum is 46.

The square root of 61939945 is about 7870.1934537850. The cubic root of 61939945 is about 395.6613287278.

The spelling of 61939945 in words is "sixty-one million, nine hundred thirty-nine thousand, nine hundred forty-five".