61658020 has 12 divisors (see below), whose sum is σ = 129481884. Its totient is φ = 24663200.

The previous prime is 61657993. The next prime is 61658029. The reversal of 61658020 is 2085616.

It can be written as a sum of positive squares in 2 ways, for example, as 45481536 + 16176484 = 6744^2 + 4022^2 .

It is a super-2 number, since 2×61658020² = 7603422860640800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61658020.

It is not an unprimeable number, because it can be changed into a prime (61658029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1541431 + ... + 1541470.

It is an arithmetic number, because the mean of its divisors is an integer number (10790157).

Almost surely, 2^61658020 is an apocalyptic number.

It is an amenable number.

61658020 is an abundant number, since it is smaller than the sum of its proper divisors (67823864).

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

61658020 is a wasteful number, since it uses less digits than its factorization.

61658020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3082910 (or 3082908 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 61658020 is about 7852.2620944541. The cubic root of 61658020 is about 395.0601201019.

The spelling of 61658020 in words is "sixty-one million, six hundred fifty-eight thousand, twenty".