61151878 has 4 divisors (see below), whose sum is σ = 91727820. Its totient is φ = 30575938.

The previous prime is 61151863. The next prime is 61151879. The reversal of 61151878 is 87815116.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61151879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15287968 + ... + 15287971.

It is an arithmetic number, because the mean of its divisors is an integer number (22931955).

Almost surely, 2^61151878 is an apocalyptic number.

61151878 is a deficient number, since it is larger than the sum of its proper divisors (30575942).

61151878 is a wasteful number, since it uses less digits than its factorization.

61151878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30575941.

The product of its digits is 13440, while the sum is 37.

The square root of 61151878 is about 7819.9666239697. The cubic root of 61151878 is about 393.9761509953.

The spelling of 61151878 in words is "sixty-one million, one hundred fifty-one thousand, eight hundred seventy-eight".