61530402 has 32 divisors (see below), whose sum is σ = 128016000. Its totient is φ = 19692288.

The previous prime is 61530401. The next prime is 61530409. The reversal of 61530402 is 20403516.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (61530401) 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, 33738 + ... + 35514.

It is an arithmetic number, because the mean of its divisors is an integer number (4000500).

Almost surely, 2^61530402 is an apocalyptic number.

61530402 is an abundant number, since it is smaller than the sum of its proper divisors (66485598).

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

61530402 is a wasteful number, since it uses less digits than its factorization.

61530402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2010.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 61530402 is about 7844.1316919083. The cubic root of 61530402 is about 394.7873704731.

Adding to 61530402 its reverse (20403516), we get a palindrome (81933918).

The spelling of 61530402 in words is "sixty-one million, five hundred thirty thousand, four hundred two".