61500030 has 32 divisors (see below), whose sum is σ = 147891744. Its totient is φ = 16367616.

The previous prime is 61499993. The next prime is 61500059. The reversal of 61500030 is 3000516.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a junction number, because it is equal to n+sod(n) for n = 61499982 and 61500009.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16062 + ... + 19518.

It is an arithmetic number, because the mean of its divisors is an integer number (4621617).

Almost surely, 2^61500030 is an apocalyptic number.

61500030 is an abundant number, since it is smaller than the sum of its proper divisors (86391714).

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

61500030 is a wasteful number, since it uses less digits than its factorization.

61500030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4060.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 61500030 is about 7842.1954834090. The cubic root of 61500030 is about 394.7224028309.

Adding to 61500030 its reverse (3000516), we get a palindrome (64500546).

The spelling of 61500030 in words is "sixty-one million, five hundred thousand, thirty".