61651378 has 4 divisors (see below), whose sum is σ = 92477070. Its totient is φ = 30825688.

The previous prime is 61651313. The next prime is 61651391. The reversal of 61651378 is 87315616.

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

It can be written as a sum of positive squares in only one way, i.e., 35916049 + 25735329 = 5993^2 + 5073^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15412843 + ... + 15412846.

Almost surely, 2^61651378 is an apocalyptic number.

61651378 is a deficient number, since it is larger than the sum of its proper divisors (30825692).

61651378 is a wasteful number, since it uses less digits than its factorization.

61651378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30825691.

The product of its digits is 30240, while the sum is 37.

The square root of 61651378 is about 7851.8391476138. The cubic root of 61651378 is about 395.0459338774.

The spelling of 61651378 in words is "sixty-one million, six hundred fifty-one thousand, three hundred seventy-eight".