61516020 has 24 divisors (see below), whose sum is σ = 172245024. Its totient is φ = 16404256.

The previous prime is 61515967. The next prime is 61516051. The reversal of 61516020 is 2061516.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 512574 + ... + 512693.

It is an arithmetic number, because the mean of its divisors is an integer number (7176876).

Almost surely, 2^61516020 is an apocalyptic number.

61516020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61516020 is an abundant number, since it is smaller than the sum of its proper divisors (110729004).

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

61516020 is a wasteful number, since it uses less digits than its factorization.

61516020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025279 (or 1025277 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 61516020 is about 7843.2149020666. The cubic root of 61516020 is about 394.7566091247.

Adding to 61516020 its reverse (2061516), we get a palindrome (63577536).

The spelling of 61516020 in words is "sixty-one million, five hundred sixteen thousand, twenty".