61420815 has 16 divisors (see below), whose sum is σ = 109192800. Its totient is φ = 32757696.

The previous prime is 61420771. The next prime is 61420819. The reversal of 61420815 is 51802416.

It is not a de Polignac number, because 61420815 - 2¹³ = 61412623 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61420819) 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, 227350 + ... + 227619.

It is an arithmetic number, because the mean of its divisors is an integer number (6824550).

Almost surely, 2^61420815 is an apocalyptic number.

61420815 is a deficient number, since it is larger than the sum of its proper divisors (47771985).

61420815 is a wasteful number, since it uses less digits than its factorization.

61420815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454983 (or 454977 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 61420815 is about 7837.1432933180. The cubic root of 61420815 is about 394.5528561948.

The spelling of 61420815 in words is "sixty-one million, four hundred twenty thousand, eight hundred fifteen".