61628945 has 32 divisors (see below), whose sum is σ = 88010496. Its totient is φ = 40550400.

The previous prime is 61628929. The next prime is 61628947. The reversal of 61628945 is 54982616.

It is a happy number.

It is not a de Polignac number, because 61628945 - 2⁴ = 61628929 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is not an unprimeable number, because it can be changed into a prime (61628947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95825 + ... + 96465.

It is an arithmetic number, because the mean of its divisors is an integer number (2750328).

Almost surely, 2^61628945 is an apocalyptic number.

61628945 is the 6410-th pentagonal number.

It is an amenable number.

61628945 is a deficient number, since it is larger than the sum of its proper divisors (26381551).

61628945 is a wasteful number, since it uses less digits than its factorization.

61628945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761.

The product of its digits is 103680, while the sum is 41.

The square root of 61628945 is about 7850.4104988211. The cubic root of 61628945 is about 394.9980131289.

The spelling of 61628945 in words is "sixty-one million, six hundred twenty-eight thousand, nine hundred forty-five".