61520215 has 8 divisors (see below), whose sum is σ = 74175408. Its totient is φ = 48982080.

The previous prime is 61520203. The next prime is 61520219. The reversal of 61520215 is 51202516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61520215 - 2⁵ = 61520183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61520219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28102 + ... + 30211.

It is an arithmetic number, because the mean of its divisors is an integer number (9271926).

Almost surely, 2^61520215 is an apocalyptic number.

61520215 is a deficient number, since it is larger than the sum of its proper divisors (12655193).

61520215 is a wasteful number, since it uses less digits than its factorization.

61520215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58529.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 61520215 is about 7843.4823261100. The cubic root of 61520215 is about 394.7655822146.

The spelling of 61520215 in words is "sixty-one million, five hundred twenty thousand, two hundred fifteen".