84978770 has 8 divisors (see below), whose sum is σ = 152961804. Its totient is φ = 33991504.

The previous prime is 84978763. The next prime is 84978779. The reversal of 84978770 is 7787948.

It can be written as a sum of positive squares in 2 ways, for example, as 84070561 + 908209 = 9169^2 + 953^2 .

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

It is not an unprimeable number, because it can be changed into a prime (84978779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4248929 + ... + 4248948.

Almost surely, 2^84978770 is an apocalyptic number.

84978770 is a deficient number, since it is larger than the sum of its proper divisors (67983034).

84978770 is a wasteful number, since it uses less digits than its factorization.

84978770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8497884.

The product of its (nonzero) digits is 790272, while the sum is 50.

The square root of 84978770 is about 9218.3930269869. The cubic root of 84978770 is about 439.6463584055.

The spelling of 84978770 in words is "eighty-four million, nine hundred seventy-eight thousand, seven hundred seventy".