61008778 has 8 divisors (see below), whose sum is σ = 91550340. Its totient is φ = 30492000.

The previous prime is 61008769. The next prime is 61008817. The reversal of 61008778 is 87780016.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 59954049 + 1054729 = 7743^2 + 1027^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2278 + ... + 11278.

Almost surely, 2^61008778 is an apocalyptic number.

61008778 is a deficient number, since it is larger than the sum of its proper divisors (30541562).

61008778 is a wasteful number, since it uses less digits than its factorization.

61008778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12392.

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 61008778 is about 7810.8116095576. The cubic root of 61008778 is about 393.6685996845.

It can be divided in two parts, 6100 and 8778, that added together give a triangular number (14878 = T₁₇₂).

The spelling of 61008778 in words is "sixty-one million, eight thousand, seven hundred seventy-eight".