61769945 has 4 divisors (see below), whose sum is σ = 74123940. Its totient is φ = 49415952.

The previous prime is 61769849. The next prime is 61769957. The reversal of 61769945 is 54996716.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43072969 + 18696976 = 6563^2 + 4324^2 .

It is a cyclic number.

It is not a de Polignac number, because 61769945 - 2²² = 57575641 is a prime.

It is a super-2 number, since 2×61769945² = 7631052210606050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61769945.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6176990 + ... + 6176999.

It is an arithmetic number, because the mean of its divisors is an integer number (18530985).

Almost surely, 2^61769945 is an apocalyptic number.

It is an amenable number.

61769945 is a deficient number, since it is larger than the sum of its proper divisors (12353995).

61769945 is a wasteful number, since it uses less digits than its factorization.

61769945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12353994.

The product of its digits is 408240, while the sum is 47.

The square root of 61769945 is about 7859.3857902510. The cubic root of 61769945 is about 395.2990204958.

The spelling of 61769945 in words is "sixty-one million, seven hundred sixty-nine thousand, nine hundred forty-five".