61509070 has 32 divisors (see below), whose sum is σ = 128276928. Its totient is φ = 20798208.

The previous prime is 61509031. The next prime is 61509073. The reversal of 61509070 is 7090516.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61509073) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 909 + ... + 11128.

It is an arithmetic number, because the mean of its divisors is an integer number (4008654).

Almost surely, 2^61509070 is an apocalyptic number.

61509070 is an abundant number, since it is smaller than the sum of its proper divisors (66767858).

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

61509070 is a wasteful number, since it uses less digits than its factorization.

61509070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12124.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 61509070 is about 7842.7718314382. The cubic root of 61509070 is about 394.7417422019.

Adding to 61509070 its reverse (7090516), we get a palindrome (68599586).

The spelling of 61509070 in words is "sixty-one million, five hundred nine thousand, seventy".