61620745 has 8 divisors (see below), whose sum is σ = 75748680. Its totient is φ = 48094080.

The previous prime is 61620709. The next prime is 61620761. The reversal of 61620745 is 54702616.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1201216 + 60419529 = 1096^2 + 7773^2 .

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

It is not a de Polignac number, because 61620745 - 2⁷ = 61620617 is a prime.

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, 150090 + ... + 150499.

It is an arithmetic number, because the mean of its divisors is an integer number (9468585).

Almost surely, 2^61620745 is an apocalyptic number.

It is an amenable number.

61620745 is a deficient number, since it is larger than the sum of its proper divisors (14127935).

61620745 is a wasteful number, since it uses less digits than its factorization.

61620745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300635.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 61620745 is about 7849.8882157646. Note that the first 3 decimals coincide. The cubic root of 61620745 is about 394.9804936156.

The spelling of 61620745 in words is "sixty-one million, six hundred twenty thousand, seven hundred forty-five".